Add m-esr52 at 52.6.0

49 files changed, 7759 insertions, 0 deletions

diff --git a/mobile/android/components/AboutRedirector.js b/mobile/android/components/AboutRedirector.js
new file mode 100644
index 0000000000..df50864dd2
--- /dev/null
+++ b/mobile/android/components/AboutRedirector.js
@@ -0,0 +1,132 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/AppConstants.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+var modules = {
+  // about:
+  "": {
+    uri: "chrome://browser/content/about.xhtml",
+    privileged: true
+  },
+
+  // about:fennec and about:firefox are aliases for about:,
+  // but hidden from about:about
+  fennec: {
+    uri: "chrome://browser/content/about.xhtml",
+    privileged: true,
+    hide: true
+  },
+  get firefox() {
+    return this.fennec
+  },
+
+  // about:blank has some bad loading behavior we can avoid, if we use an alias
+  empty: {
+    uri: "about:blank",
+    privileged: false,
+    hide: true
+  },
+
+  rights: {
+    uri: "chrome://browser/content/aboutRights.xhtml",
+    privileged: false
+  },
+  blocked: {
+    uri: "chrome://browser/content/blockedSite.xhtml",
+    privileged: false,
+    hide: true
+  },
+  certerror: {
+    uri: "chrome://browser/content/aboutCertError.xhtml",
+    privileged: false,
+    hide: true
+  },
+  home: {
+    uri: "chrome://browser/content/aboutHome.xhtml",
+    privileged: false
+  },
+  downloads: {
+    uri: "chrome://browser/content/aboutDownloads.xhtml",
+    privileged: true
+  },
+  reader: {
+    uri: "chrome://global/content/reader/aboutReader.html",
+    privileged: false,
+    hide: true
+  },
+  feedback: {
+    uri: "chrome://browser/content/aboutFeedback.xhtml",
+    privileged: true
+  },
+  privatebrowsing: {
+    uri: "chrome://browser/content/aboutPrivateBrowsing.xhtml",
+    privileged: true
+  },
+  logins: {
+    uri: "chrome://browser/content/aboutLogins.xhtml",
+    privileged: true
+  },
+  accounts: {
+    uri: "chrome://browser/content/aboutAccounts.xhtml",
+    privileged: true
+  },
+};
+
+if (AppConstants.MOZ_SERVICES_HEALTHREPORT) {
+  modules['healthreport'] = {
+    uri: "chrome://browser/content/aboutHealthReport.xhtml",
+    privileged: true
+  };
+}
+
+function AboutRedirector() {}
+AboutRedirector.prototype = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIAboutModule]),
+  classID: Components.ID("{322ba47e-7047-4f71-aebf-cb7d69325cd9}"),
+
+  _getModuleInfo: function (aURI) {
+    let moduleName = aURI.path.replace(/[?#].*/, "").toLowerCase();
+    return modules[moduleName];
+  },
+
+  // nsIAboutModule
+  getURIFlags: function(aURI) {
+    let flags;
+    let moduleInfo = this._getModuleInfo(aURI);
+    if (moduleInfo.hide)
+      flags = Ci.nsIAboutModule.HIDE_FROM_ABOUTABOUT;
+
+    return flags | Ci.nsIAboutModule.ALLOW_SCRIPT;
+  },
+
+  newChannel: function(aURI, aLoadInfo) {
+    let moduleInfo = this._getModuleInfo(aURI);
+
+    var ios = Cc["@mozilla.org/network/io-service;1"].
+              getService(Ci.nsIIOService);
+
+    var newURI = ios.newURI(moduleInfo.uri, null, null);
+
+    var channel = ios.newChannelFromURIWithLoadInfo(newURI, aLoadInfo);
+
+    if (!moduleInfo.privileged) {
+      // Setting the owner to null means that we'll go through the normal
+      // path in GetChannelPrincipal and create a codebase principal based
+      // on the channel's originalURI
+      channel.owner = null;
+    }
+
+    channel.originalURI = aURI;
+
+    return channel;
+  }
+};
+
+const components = [AboutRedirector];
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory(components);
diff --git a/mobile/android/components/AddonUpdateService.js b/mobile/android/components/AddonUpdateService.js
new file mode 100644
index 0000000000..2505e27962
--- /dev/null
+++ b/mobile/android/components/AddonUpdateService.js
@@ -0,0 +1,75 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "AddonManagerPrivate",
+                                  "resource://gre/modules/AddonManager.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "AddonRepository",
+                                  "resource://gre/modules/addons/AddonRepository.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "GMPInstallManager",
+                                  "resource://gre/modules/GMPInstallManager.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Messaging",
+                                  "resource://gre/modules/Messaging.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "OS", "resource://gre/modules/osfile.jsm");
+
+function getPref(func, preference, defaultValue) {
+  try {
+    return Services.prefs[func](preference);
+  }
+  catch (e) {}
+  return defaultValue;
+}
+
+// -----------------------------------------------------------------------
+// Add-on auto-update management service
+// -----------------------------------------------------------------------
+
+const PREF_ADDON_UPDATE_ENABLED  = "extensions.autoupdate.enabled";
+const PREF_ADDON_UPDATE_INTERVAL = "extensions.autoupdate.interval";
+
+var gNeedsRestart = false;
+
+function AddonUpdateService() {}
+
+AddonUpdateService.prototype = {
+  classDescription: "Add-on auto-update management",
+  classID: Components.ID("{93c8824c-9b87-45ae-bc90-5b82a1e4d877}"),
+  
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsITimerCallback]),
+
+  notify: function aus_notify(aTimer) {
+    if (aTimer && !getPref("getBoolPref", PREF_ADDON_UPDATE_ENABLED, true))
+      return;
+
+    // If we already auto-upgraded and installed new versions, ignore this check
+    if (gNeedsRestart)
+      return;
+
+    AddonManagerPrivate.backgroundUpdateCheck();
+
+    let gmp = new GMPInstallManager();
+    gmp.simpleCheckAndInstall().then(null, () => {});
+
+    let interval = 1000 * getPref("getIntPref", PREF_ADDON_UPDATE_INTERVAL, 86400);
+    Messaging.sendRequest({
+      type: "Gecko:ScheduleRun",
+      action: "update-addons",
+      trigger: interval,
+      interval: interval,
+    });
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([AddonUpdateService]);
+
diff --git a/mobile/android/components/BlocklistPrompt.js b/mobile/android/components/BlocklistPrompt.js
new file mode 100644
index 0000000000..ce7b8e011e
--- /dev/null
+++ b/mobile/android/components/BlocklistPrompt.js
@@ -0,0 +1,61 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+const Cc = Components.classes;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+// -----------------------------------------------------------------------
+// BlocklistPrompt Service
+// -----------------------------------------------------------------------
+
+
+function BlocklistPrompt() { }
+
+BlocklistPrompt.prototype = {
+  prompt: function(aAddons, aCount) {
+    let win = Services.wm.getMostRecentWindow("navigator:browser");
+    if (win.ExtensionsView.visible) {
+      win.ExtensionsView.showRestart("blocked");
+    } else {
+      let bundle = Services.strings.createBundle("chrome://browser/locale/browser.properties");
+      let notifyBox = win.getNotificationBox();
+      let restartCallback = function(aNotification, aDescription) {
+        // Notify all windows that an application quit has been requested
+        var cancelQuit = Cc["@mozilla.org/supports-PRBool;1"].createInstance(Ci.nsISupportsPRBool);
+        Services.obs.notifyObservers(cancelQuit, "quit-application-requested", "restart");
+  
+        // If nothing aborted, quit the app
+        if (cancelQuit.data == false) {
+          let appStartup = Cc["@mozilla.org/toolkit/app-startup;1"].getService(Ci.nsIAppStartup);
+          appStartup.quit(Ci.nsIAppStartup.eRestart | Ci.nsIAppStartup.eAttemptQuit);
+        }
+      };
+      
+      let buttons = [{accessKey: null,
+                      label: bundle.GetStringFromName("notificationRestart.button"),
+                      callback: restartCallback}];
+      notifyBox.appendNotification(bundle.GetStringFromName("notificationRestart.blocked"),
+                                   "blocked-add-on",
+                                   "",
+                                   "PRIORITY_CRITICAL_HIGH",
+                                   buttons);
+    }
+    // Disable softblocked items automatically
+    for (let i = 0; i < aAddons.length; i++) {
+      if (aAddons[i].item instanceof Ci.nsIPluginTag)
+        aAddons[i].item.disabled = true;
+      else
+        aAddons[i].item.userDisabled = true;
+    }
+  },
+  classID: Components.ID("{4e6ea350-b09a-11df-94e2-0800200c9a66}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIBlocklistPrompt])
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([BlocklistPrompt]);
+
diff --git a/mobile/android/components/BrowserCLH.js b/mobile/android/components/BrowserCLH.js
new file mode 100644
index 0000000000..4cbf03554e
--- /dev/null
+++ b/mobile/android/components/BrowserCLH.js
@@ -0,0 +1,47 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+function BrowserCLH() {}
+
+BrowserCLH.prototype = {
+  /**
+   * Register resource://android as the APK root.
+   *
+   * Consumers can access Android assets using resource://android/assets/FILENAME.
+   */
+  setResourceSubstitutions: function () {
+    let registry = Cc["@mozilla.org/chrome/chrome-registry;1"].getService(Ci["nsIChromeRegistry"]);
+    // Like jar:jar:file:///data/app/org.mozilla.fennec-2.apk!/assets/omni.ja!/chrome/chrome/content/aboutHome.xhtml
+    let url = registry.convertChromeURL(Services.io.newURI("chrome://browser/content/aboutHome.xhtml", null, null)).spec;
+    // Like jar:file:///data/app/org.mozilla.fennec-2.apk!/
+    url = url.substring(4, url.indexOf("!/") + 2);
+
+    let protocolHandler = Services.io.getProtocolHandler("resource").QueryInterface(Ci.nsIResProtocolHandler);
+    protocolHandler.setSubstitution("android", Services.io.newURI(url, null, null));
+  },
+
+  observe: function (subject, topic, data) {
+    switch (topic) {
+      case "app-startup":
+        this.setResourceSubstitutions();
+        break;
+    }
+  },
+
+  // QI
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver]),
+
+  // XPCOMUtils factory
+  classID: Components.ID("{be623d20-d305-11de-8a39-0800200c9a66}")
+};
+
+var components = [ BrowserCLH ];
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory(components);
diff --git a/mobile/android/components/ColorPicker.js b/mobile/android/components/ColorPicker.js
new file mode 100644
index 0000000000..7d478da803
--- /dev/null
+++ b/mobile/android/components/ColorPicker.js
@@ -0,0 +1,55 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+const Cc = Components.classes;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Prompt",
+                                  "resource://gre/modules/Prompt.jsm");
+
+function ColorPicker() {
+}
+
+ColorPicker.prototype = {
+  _initial: 0,
+  _domWin: null,
+  _title: "",
+
+  get strings() {
+    if (!this._strings) {
+      this._strings = Services.strings.createBundle("chrome://browser/locale/browser.properties");
+    }
+    return this._strings;
+  },
+
+  init: function(aParent, aTitle, aInitial) {
+    this._domWin = aParent;
+    this._initial = aInitial;
+    this._title = aTitle;
+  },
+
+  open: function(aCallback) {
+    let p = new Prompt({ title: this._title,
+                         buttons: [
+                            this.strings.GetStringFromName("inputWidgetHelper.set"),
+                            this.strings.GetStringFromName("inputWidgetHelper.cancel")
+                         ] })
+                      .addColorPicker({ value: this._initial })
+                      .show((data) => {
+      if (data.button == 0)
+        aCallback.done(data.color0);
+      else
+        aCallback.done(this._initial);
+    });
+  },
+
+  classID: Components.ID("{430b987f-bb9f-46a3-99a5-241749220b29}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIColorPicker])
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([ColorPicker]);
diff --git a/mobile/android/components/ContentDispatchChooser.js b/mobile/android/components/ContentDispatchChooser.js
new file mode 100644
index 0000000000..b28e356e02
--- /dev/null
+++ b/mobile/android/components/ContentDispatchChooser.js
@@ -0,0 +1,83 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+const Cc = Components.classes;
+const Cr = Components.results;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/Messaging.jsm");
+
+function ContentDispatchChooser() {}
+
+ContentDispatchChooser.prototype =
+{
+  classID: Components.ID("5a072a22-1e66-4100-afc1-07aed8b62fc5"),
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIContentDispatchChooser]),
+
+  get protoSvc() {
+    if (!this._protoSvc) {
+      this._protoSvc = Cc["@mozilla.org/uriloader/external-protocol-service;1"].getService(Ci.nsIExternalProtocolService);
+    }
+    return this._protoSvc;
+  },
+
+  _getChromeWin: function getChromeWin() {
+    try {
+      return Services.wm.getMostRecentWindow("navigator:browser");
+    } catch (e) {
+      throw Cr.NS_ERROR_FAILURE;
+    }
+  },
+
+  ask: function ask(aHandler, aWindowContext, aURI, aReason) {
+    let window = null;
+    try {
+      if (aWindowContext)
+        window = aWindowContext.getInterface(Ci.nsIDOMWindow);
+    } catch (e) { /* it's OK to not have a window */ }
+
+    // The current list is based purely on the scheme. Redo the query using the url to get more
+    // specific results.
+    aHandler = this.protoSvc.getProtocolHandlerInfoFromOS(aURI.spec, {});
+
+    // The first handler in the set is the Android Application Chooser (which will fall back to a default if one is set)
+    // If we have more than one option, let the OS handle showing a list (if needed).
+    if (aHandler.possibleApplicationHandlers.length > 1) {
+      aHandler.launchWithURI(aURI, aWindowContext);
+    } else {
+      // xpcshell tests do not have an Android Bridge but we require Android
+      // Bridge when using Messaging so we guard against this case. xpcshell
+      // tests also do not have a window, so we use this state to guard.
+      let win = this._getChromeWin();
+      if (!win) {
+        return;
+      }
+
+      let msg = {
+        type: "Intent:OpenNoHandler",
+        uri: aURI.spec,
+      };
+
+      Messaging.sendRequestForResult(msg).then(() => {
+        // Java opens an app on success: take no action.
+      }, (uri) => {
+        // We couldn't open this. If this was from a click, it's likely that we just
+        // want this to fail silently. If the user entered this on the address bar, though,
+        // we want to show the neterror page.
+
+        let dwu = window.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+        let millis = dwu.millisSinceLastUserInput;
+        if (millis > 0 && millis >= 1000) {
+          window.location.href = uri;
+        }
+      });
+    }
+  },
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([ContentDispatchChooser]);
diff --git a/mobile/android/components/ContentPermissionPrompt.js b/mobile/android/components/ContentPermissionPrompt.js
new file mode 100644
index 0000000000..fd13ce26b3
--- /dev/null
+++ b/mobile/android/components/ContentPermissionPrompt.js
@@ -0,0 +1,146 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Ci = Components.interfaces;
+const Cr = Components.results;
+const Cu = Components.utils;
+const Cc = Components.classes;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+const kEntities = {
+  "contacts": "contacts",
+  "desktop-notification": "desktopNotification2",
+  "geolocation": "geolocation",
+  "flyweb-publish-server": "flyWebPublishServer",
+};
+
+// For these types, prompt for permission if action is unknown.
+const PROMPT_FOR_UNKNOWN = [
+  "desktop-notification",
+  "geolocation",
+  "flyweb-publish-server",
+];
+
+function ContentPermissionPrompt() {}
+
+ContentPermissionPrompt.prototype = {
+  classID: Components.ID("{C6E8C44D-9F39-4AF7-BCC0-76E38A8310F5}"),
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIContentPermissionPrompt]),
+
+  handleExistingPermission: function handleExistingPermission(request, type, denyUnknown) {
+    let result = Services.perms.testExactPermissionFromPrincipal(request.principal, type);
+    if (result == Ci.nsIPermissionManager.ALLOW_ACTION) {
+      request.allow();
+      return true;
+    }
+
+    if (result == Ci.nsIPermissionManager.DENY_ACTION) {
+      request.cancel();
+      return true;
+    }
+
+    if (denyUnknown && result == Ci.nsIPermissionManager.UNKNOWN_ACTION) {
+      request.cancel();
+      return true;
+    }
+
+    return false;
+  },
+
+  getChromeWindow: function getChromeWindow(aWindow) {
+     let chromeWin = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+                            .getInterface(Ci.nsIWebNavigation)
+                            .QueryInterface(Ci.nsIDocShellTreeItem)
+                            .rootTreeItem
+                            .QueryInterface(Ci.nsIInterfaceRequestor)
+                            .getInterface(Ci.nsIDOMWindow)
+                            .QueryInterface(Ci.nsIDOMChromeWindow);
+     return chromeWin;
+  },
+
+  getChromeForRequest: function getChromeForRequest(request) {
+    if (request.window) {
+      let requestingWindow = request.window.top;
+      return this.getChromeWindow(requestingWindow).wrappedJSObject;
+    }
+    return request.element.ownerDocument.defaultView;
+  },
+
+  prompt: function(request) {
+    let isApp = request.principal.appId !== Ci.nsIScriptSecurityManager.NO_APP_ID && request.principal.appId !== Ci.nsIScriptSecurityManager.UNKNOWN_APP_ID;
+
+    // Only allow exactly one permission rquest here.
+    let types = request.types.QueryInterface(Ci.nsIArray);
+    if (types.length != 1) {
+      request.cancel();
+      return;
+    }
+    let perm = types.queryElementAt(0, Ci.nsIContentPermissionType);
+
+    // Returns true if the request was handled
+    let access = (perm.access && perm.access !== "unused") ?
+                 (perm.type + "-" + perm.access) : perm.type;
+    if (this.handleExistingPermission(request, access,
+          /* denyUnknown */ isApp || PROMPT_FOR_UNKNOWN.indexOf(perm.type) < 0))
+       return;
+
+    let chromeWin = this.getChromeForRequest(request);
+    let tab = chromeWin.BrowserApp.getTabForWindow(request.window.top);
+    if (!tab)
+      return;
+
+    let browserBundle = Services.strings.createBundle("chrome://browser/locale/browser.properties");
+    let entityName = kEntities[perm.type];
+
+    let buttons = [{
+      label: browserBundle.GetStringFromName(entityName + ".dontAllow"),
+      callback: function(aChecked) {
+        // If the user checked "Don't ask again" or this is a desktopNotification, make a permanent exception
+        if (aChecked || entityName == "desktopNotification2")
+          Services.perms.addFromPrincipal(request.principal, access, Ci.nsIPermissionManager.DENY_ACTION);
+
+        request.cancel();
+      }
+    },
+    {
+      label: browserBundle.GetStringFromName(entityName + ".allow"),
+      callback: function(aChecked) {
+        // If the user checked "Don't ask again" or this is a desktopNotification, make a permanent exception
+        if (aChecked || entityName == "desktopNotification2") {
+          Services.perms.addFromPrincipal(request.principal, access, Ci.nsIPermissionManager.ALLOW_ACTION);
+        } else if (isApp) {
+          // Otherwise allow the permission for the current session if the request comes from an app
+          Services.perms.addFromPrincipal(request.principal, access, Ci.nsIPermissionManager.ALLOW_ACTION, Ci.nsIPermissionManager.EXPIRE_SESSION);
+        }
+
+        request.allow();
+      },
+      positive: true
+    }];
+
+    let requestor = chromeWin.BrowserApp.manifest ? "'" + chromeWin.BrowserApp.manifest.name + "'" : request.principal.URI.host;
+    let message = browserBundle.formatStringFromName(entityName + ".ask", [requestor], 1);
+    // desktopNotification doesn't have a checkbox
+    let options;
+    if (entityName == "desktopNotification2") {
+      options = {
+        link: {
+          label: browserBundle.GetStringFromName("doorhanger.learnMore"),
+          url: "https://www.mozilla.org/firefox/push/"
+        }
+      };
+    } else {
+      options = { checkbox: browserBundle.GetStringFromName(entityName + ".dontAskAgain") };
+    }
+
+    chromeWin.NativeWindow.doorhanger.show(message, entityName + request.principal.URI.host, buttons, tab.id, options, entityName.toUpperCase());
+  }
+};
+
+
+//module initialization
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([ContentPermissionPrompt]);
diff --git a/mobile/android/components/DirectoryProvider.js b/mobile/android/components/DirectoryProvider.js
new file mode 100644
index 0000000000..5d0f7974c9
--- /dev/null
+++ b/mobile/android/components/DirectoryProvider.js
@@ -0,0 +1,214 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/AppConstants.jsm");
+Cu.import("resource://gre/modules/FileUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "JNI", "resource://gre/modules/JNI.jsm");
+
+// -----------------------------------------------------------------------
+// Directory Provider for special browser folders and files
+// -----------------------------------------------------------------------
+
+const NS_APP_CACHE_PARENT_DIR = "cachePDir";
+const NS_APP_SEARCH_DIR       = "SrchPlugns";
+const NS_APP_SEARCH_DIR_LIST  = "SrchPluginsDL";
+const NS_APP_DISTRIBUTION_SEARCH_DIR_LIST = "SrchPluginsDistDL";
+const NS_APP_USER_SEARCH_DIR  = "UsrSrchPlugns";
+const NS_XPCOM_CURRENT_PROCESS_DIR = "XCurProcD";
+const XRE_APP_DISTRIBUTION_DIR = "XREAppDist";
+const XRE_UPDATE_ROOT_DIR     = "UpdRootD";
+const ENVVAR_UPDATE_DIR       = "UPDATES_DIRECTORY";
+const WEBAPPS_DIR             = "webappsDir";
+
+const SYSTEM_DIST_PATH = `/system/${AppConstants.ANDROID_PACKAGE_NAME}/distribution`;
+
+function DirectoryProvider() {}
+
+DirectoryProvider.prototype = {
+  classID: Components.ID("{ef0f7a87-c1ee-45a8-8d67-26f586e46a4b}"),
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIDirectoryServiceProvider,
+                                         Ci.nsIDirectoryServiceProvider2]),
+
+  getFile: function(prop, persistent) {
+    if (prop == NS_APP_CACHE_PARENT_DIR) {
+      let dirsvc = Cc["@mozilla.org/file/directory_service;1"].getService(Ci.nsIProperties);
+      let profile = dirsvc.get("ProfD", Ci.nsIFile);
+      return profile;
+    } else if (prop == WEBAPPS_DIR) {
+      // returns the folder that should hold the webapps database file
+      // For fennec we will store that in the root profile folder so that all
+      // webapps can easily access it
+      let dirsvc = Cc["@mozilla.org/file/directory_service;1"].getService(Ci.nsIProperties);
+      let profile = dirsvc.get("ProfD", Ci.nsIFile);
+      return profile.parent;
+    } else if (prop == XRE_APP_DISTRIBUTION_DIR) {
+      let distributionDirectories =  this._getDistributionDirectories();
+      for (let i = 0; i < distributionDirectories.length; i++) {
+        if (distributionDirectories[i].exists()) {
+          return distributionDirectories[i];
+        }
+      }
+      // Fallback: Return default data distribution directory
+      return FileUtils.getDir(NS_XPCOM_CURRENT_PROCESS_DIR, ["distribution"], false);
+    } else if (prop == XRE_UPDATE_ROOT_DIR) {
+      let env = Cc["@mozilla.org/process/environment;1"].getService(Ci.nsIEnvironment);
+      if (env.exists(ENVVAR_UPDATE_DIR)) {
+        let path = env.get(ENVVAR_UPDATE_DIR);
+        if (path) {
+          return new FileUtils.File(path);
+        }
+      }
+      return new FileUtils.File(env.get("DOWNLOADS_DIRECTORY"));
+    }
+
+    // We are retuning null to show failure instead for throwing an error. The
+    // interface is called quite a bit and throwing an error is noisy. Returning
+    // null works with the way the interface is called [see bug 529077]
+    return null;
+  },
+
+  /**
+   * Appends the distribution-specific search engine directories to the array.
+   * The distribution directory structure is as follows:
+   *
+   * \- distribution/
+   *    \- searchplugins/
+   *       |- common/
+   *       \- locale/
+   *          |- <locale 1>/
+   *          ...
+   *          \- <locale N>/
+   *
+   * Common engines are loaded for all locales. If there is no locale directory for
+   * the current locale, there is a pref: "distribution.searchplugins.defaultLocale",
+   * which specifies a default locale to use.
+   */
+  _appendDistroSearchDirs: function(array) {
+    let distro = this.getFile(XRE_APP_DISTRIBUTION_DIR);
+    if (!distro.exists())
+      return;
+
+    let searchPlugins = distro.clone();
+    searchPlugins.append("searchplugins");
+    if (!searchPlugins.exists())
+      return;
+
+    let commonPlugins = searchPlugins.clone();
+    commonPlugins.append("common");
+    if (commonPlugins.exists())
+      array.push(commonPlugins);
+
+    let localePlugins = searchPlugins.clone();
+    localePlugins.append("locale");
+    if (!localePlugins.exists())
+      return;
+
+    let curLocale = "";
+    try {
+      curLocale = Services.prefs.getComplexValue("general.useragent.locale", Ci.nsIPrefLocalizedString).data;
+    } catch (e) {
+      try {
+        curLocale = Services.prefs.getCharPref("general.useragent.locale");
+      } catch (ee) {
+      }
+    }
+
+    if (curLocale) {
+      let curLocalePlugins = localePlugins.clone();
+      curLocalePlugins.append(curLocale);
+      if (curLocalePlugins.exists()) {
+        array.push(curLocalePlugins);
+        return;
+      }
+    }
+
+    // We didn't append the locale dir - try the default one.
+    try {
+      let defLocale = Services.prefs.getCharPref("distribution.searchplugins.defaultLocale");
+      let defLocalePlugins = localePlugins.clone();
+      defLocalePlugins.append(defLocale);
+      if (defLocalePlugins.exists())
+        array.push(defLocalePlugins);
+    } catch(e) {
+    }
+  },
+
+  getFiles: function(prop) {
+    if (prop != NS_APP_SEARCH_DIR_LIST &&
+        prop != NS_APP_DISTRIBUTION_SEARCH_DIR_LIST)
+      return null;
+
+    let result = [];
+
+    if (prop == NS_APP_DISTRIBUTION_SEARCH_DIR_LIST) {
+      this._appendDistroSearchDirs(result);
+    }
+    else {
+      /**
+       * We want to preserve the following order, since the search service
+       * loads engines in first-loaded-wins order.
+       *   - distro search plugin locations (loaded separately by the search
+       *     service)
+       *   - user search plugin locations (profile)
+       *   - app search plugin location (shipped engines)
+       */
+      let appUserSearchDir = FileUtils.getDir(NS_APP_USER_SEARCH_DIR, [], false);
+      if (appUserSearchDir.exists())
+        result.push(appUserSearchDir);
+
+      let appSearchDir = FileUtils.getDir(NS_APP_SEARCH_DIR, [], false);
+      if (appSearchDir.exists())
+        result.push(appSearchDir);
+    }
+
+    return {
+      QueryInterface: XPCOMUtils.generateQI([Ci.nsISimpleEnumerator]),
+      hasMoreElements: function() {
+        return result.length > 0;
+      },
+      getNext: function() {
+        return result.shift();
+      }
+    };
+  },
+
+  _getDistributionDirectories: function() {
+    let directories = [];
+    let jenv = null;
+
+    try {
+      jenv = JNI.GetForThread();
+
+      let jDistribution = JNI.LoadClass(jenv, "org.mozilla.gecko.distribution.Distribution", {
+        static_methods: [
+          { name: "getDistributionDirectories", sig: "()[Ljava/lang/String;" }
+        ],
+      });
+
+      let jDirectories = jDistribution.getDistributionDirectories();
+
+      for (let i = 0; i < jDirectories.length; i++) {
+        directories.push(new FileUtils.File(
+          JNI.ReadString(jenv, jDirectories.get(i))
+        ));
+      }
+    } finally {
+      if (jenv) {
+        JNI.UnloadClasses(jenv);
+      }
+    }
+
+    return directories;
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([DirectoryProvider]);
diff --git a/mobile/android/components/FilePicker.js b/mobile/android/components/FilePicker.js
new file mode 100644
index 0000000000..2de81ca465
--- /dev/null
+++ b/mobile/android/components/FilePicker.js
@@ -0,0 +1,302 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+const Cc = Components.classes;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/FileUtils.jsm");
+
+Cu.importGlobalProperties(['File']);
+
+function FilePicker() {
+}
+
+FilePicker.prototype = {
+  _mimeTypeFilter: 0,
+  _extensionsFilter: "",
+  _defaultString: "",
+  _domWin: null,
+  _defaultExtension: null,
+  _displayDirectory: null,
+  _filePath: null,
+  _promptActive: false,
+  _filterIndex: 0,
+  _addToRecentDocs: false,
+  _title: "",
+
+  init: function(aParent, aTitle, aMode) {
+    this._domWin = aParent;
+    this._mode = aMode;
+    this._title = aTitle;
+    Services.obs.addObserver(this, "FilePicker:Result", false);
+
+    let idService = Cc["@mozilla.org/uuid-generator;1"].getService(Ci.nsIUUIDGenerator); 
+    this.guid = idService.generateUUID().toString();
+
+    if (aMode != Ci.nsIFilePicker.modeOpen && aMode != Ci.nsIFilePicker.modeOpenMultiple)
+      throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
+  },
+
+  appendFilters: function(aFilterMask) {
+    if (aFilterMask & Ci.nsIFilePicker.filterAudio) {
+      this._mimeTypeFilter = "audio/*";
+      return;
+    }
+
+    if (aFilterMask & Ci.nsIFilePicker.filterImages) {
+      this._mimeTypeFilter = "image/*";
+      return;
+    }
+
+    if (aFilterMask & Ci.nsIFilePicker.filterVideo) {
+      this._mimeTypeFilter = "video/*";
+      return;
+    }
+
+    if (aFilterMask & Ci.nsIFilePicker.filterAll) {
+      this._mimeTypeFilter = "*/*";
+      return;
+    }
+
+    /* From BaseFilePicker.cpp */
+    if (aFilterMask & Ci.nsIFilePicker.filterHTML) {
+      this.appendFilter("*.html; *.htm; *.shtml; *.xhtml");
+    }
+    if (aFilterMask & Ci.nsIFilePicker.filterText) {
+      this.appendFilter("*.txt; *.text");
+    }
+
+    if (aFilterMask & Ci.nsIFilePicker.filterXML) {
+      this.appendFilter("*.xml");
+    }
+
+    if (aFilterMask & Ci.nsIFilePicker.xulFilter) {
+      this.appendFilter("*.xul");
+    }
+
+    if (aFilterMask & Ci.nsIFilePicker.xulFilter) {
+      this.appendFilter("..apps");
+    }
+  },
+
+  appendFilter: function(title, filter) {
+    if (this._extensionsFilter)
+        this._extensionsFilter += ", ";
+    this._extensionsFilter += filter;
+  },
+
+  get defaultString() {
+    return this._defaultString;
+  },
+
+  set defaultString(defaultString) {
+    this._defaultString = defaultString;
+  },
+
+  get defaultExtension() {
+    return this._defaultExtension;
+  },
+
+  set defaultExtension(defaultExtension) {
+    this._defaultExtension = defaultExtension;
+  },
+
+  get filterIndex() {
+    return this._filterIndex;
+  },
+
+  set filterIndex(val) {
+    this._filterIndex = val;
+  },
+  
+  get displayDirectory() {
+    return this._displayDirectory;
+  },
+
+  set displayDirectory(dir) {
+    this._displayDirectory = dir;
+  },
+
+  get file() {
+    if (!this._filePath) {
+        return null;
+    }
+
+    return new FileUtils.File(this._filePath);
+  },
+
+  get fileURL() {
+    let file = this.getFile();
+    return Services.io.newFileURI(file);
+  },
+
+  get files() {
+    return this.getEnumerator([this.file], function(file) {
+      return file;
+    });
+  },
+
+  // We don't support directory selection yet.
+  get domFileOrDirectory() {
+    let f = this.file;
+    if (!f) {
+        return null;
+    }
+
+    let win = this._domWin;
+    if (win) {
+      let utils = win.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+      return utils.wrapDOMFile(f);
+    }
+
+    return File.createFromNsIFile(f);
+  },
+
+  get domFileOrDirectoryEnumerator() {
+    let win = this._domWin;
+    return this.getEnumerator([this.file], function(file) {
+      if (win) {
+        let utils = win.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+        return utils.wrapDOMFile(file);
+      }
+
+      return File.createFromNsIFile(file);
+    });
+  },
+
+  get addToRecentDocs() {
+    return this._addToRecentDocs;
+  },
+
+  set addToRecentDocs(val) {
+    this._addToRecentDocs = val;
+  },
+
+  get mode() {
+    return this._mode;
+  },
+
+  show: function() {
+    if (this._domWin) {
+      this.fireDialogEvent(this._domWin, "DOMWillOpenModalDialog");
+      let winUtils = this._domWin.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+      winUtils.enterModalState();
+    }
+
+    this._promptActive = true;
+    this._sendMessage();
+
+    let thread = Services.tm.currentThread;
+    while (this._promptActive)
+      thread.processNextEvent(true);
+    delete this._promptActive;
+
+    if (this._domWin) {
+      let winUtils = this._domWin.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+      winUtils.leaveModalState();
+      this.fireDialogEvent(this._domWin, "DOMModalDialogClosed");
+    }
+
+    if (this._filePath)
+      return Ci.nsIFilePicker.returnOK;
+
+    return Ci.nsIFilePicker.returnCancel;
+  },
+
+  open: function(callback) {
+    this._callback = callback;
+    this._sendMessage();
+  },
+
+  _sendMessage: function() {
+    let msg = {
+      type: "FilePicker:Show",
+      guid: this.guid,
+      title: this._title,
+    };
+
+    // Knowing the window lets us destroy any temp files when the tab is closed
+    // Other consumers of the file picker may have to either wait for Android
+    // to clean up the temp dir (not guaranteed) or clean up after themselves.
+    let win = Services.wm.getMostRecentWindow('navigator:browser');
+    let tab = win.BrowserApp.getTabForWindow(this._domWin.top)
+    if (tab) {
+      msg.tabId = tab.id;
+    }
+
+    if (!this._extensionsFilter && !this._mimeTypeFilter) {
+      // If neither filters is set show anything we can.
+      msg.mode = "mimeType";
+      msg.mimeType = "*/*";
+    } else if (this._extensionsFilter) {
+      msg.mode = "extension";
+      msg.extensions = this._extensionsFilter;
+    } else {
+      msg.mode = "mimeType";
+      msg.mimeType = this._mimeTypeFilter;
+    }
+
+    this.sendMessageToJava(msg);
+  },
+
+  sendMessageToJava: function(aMsg) {
+    Services.androidBridge.handleGeckoMessage(aMsg);
+  },
+
+  observe: function(aSubject, aTopic, aData) {
+    let data = JSON.parse(aData);
+    if (data.guid != this.guid)
+      return;
+
+    this._filePath = null;
+    if (data.file)
+      this._filePath = data.file;
+
+    this._promptActive = false;
+
+    if (this._callback) {
+      this._callback.done(this._filePath ? Ci.nsIFilePicker.returnOK : Ci.nsIFilePicker.returnCancel);
+    }
+    delete this._callback;
+  },
+
+  getEnumerator: function(files, mapFunction) {
+    return {
+      QueryInterface: XPCOMUtils.generateQI([Ci.nsISimpleEnumerator]),
+      mFiles: files,
+      mIndex: 0,
+      hasMoreElements: function() {
+        return (this.mIndex < this.mFiles.length);
+      },
+      getNext: function() {
+        if (this.mIndex >= this.mFiles.length) {
+          throw Components.results.NS_ERROR_FAILURE;
+        }
+        return mapFunction(this.mFiles[this.mIndex++]);
+      }
+    };
+  },
+
+  fireDialogEvent: function(aDomWin, aEventName) {
+    // accessing the document object can throw if this window no longer exists. See bug 789888.
+    try {
+      if (!aDomWin.document)
+        return;
+      let event = aDomWin.document.createEvent("Events");
+      event.initEvent(aEventName, true, true);
+      let winUtils = aDomWin.QueryInterface(Ci.nsIInterfaceRequestor)
+                           .getInterface(Ci.nsIDOMWindowUtils);
+      winUtils.dispatchEventToChromeOnly(aDomWin, event);
+    } catch(ex) {
+    }
+  },
+
+  classID: Components.ID("{18a4e042-7c7c-424b-a583-354e68553a7f}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIFilePicker, Ci.nsIObserver])
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([FilePicker]);
diff --git a/mobile/android/components/FxAccountsPush.js b/mobile/android/components/FxAccountsPush.js
new file mode 100644
index 0000000000..e6054a2de6
--- /dev/null
+++ b/mobile/android/components/FxAccountsPush.js
@@ -0,0 +1,164 @@
+/* jshint moz: true, esnext: true */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/Messaging.jsm");
+const {
+  PushCrypto,
+  getCryptoParams,
+} = Cu.import("resource://gre/modules/PushCrypto.jsm");
+
+XPCOMUtils.defineLazyServiceGetter(this, "PushService",
+  "@mozilla.org/push/Service;1", "nsIPushService");
+XPCOMUtils.defineLazyGetter(this, "_decoder", () => new TextDecoder());
+
+const FXA_PUSH_SCOPE = "chrome://fxa-push";
+const Log = Cu.import("resource://gre/modules/AndroidLog.jsm", {}).AndroidLog.bind("FxAccountsPush");
+
+function FxAccountsPush() {
+  Services.obs.addObserver(this, "FxAccountsPush:ReceivedPushMessageToDecode", false);
+
+  Messaging.sendRequestForResult({
+    type: "FxAccountsPush:Initialized"
+  });
+}
+
+FxAccountsPush.prototype = {
+  observe: function (subject, topic, data) {
+    switch (topic) {
+      case "android-push-service":
+        if (data === "android-fxa-subscribe") {
+          this._subscribe();
+        } else if (data === "android-fxa-unsubscribe") {
+          this._unsubscribe();
+        }
+        break;
+      case "FxAccountsPush:ReceivedPushMessageToDecode":
+        this._decodePushMessage(data);
+        break;
+    }
+  },
+
+  _subscribe() {
+    Log.i("FxAccountsPush _subscribe");
+    return new Promise((resolve, reject) => {
+      PushService.subscribe(FXA_PUSH_SCOPE,
+        Services.scriptSecurityManager.getSystemPrincipal(),
+        (result, subscription) => {
+          if (Components.isSuccessCode(result)) {
+            Log.d("FxAccountsPush got subscription");
+            resolve(subscription);
+          } else {
+            Log.w("FxAccountsPush failed to subscribe", result);
+            reject(new Error("FxAccountsPush failed to subscribe"));
+          }
+        });
+    })
+    .then(subscription => {
+      Messaging.sendRequest({
+        type: "FxAccountsPush:Subscribe:Response",
+        subscription: {
+          pushCallback: subscription.endpoint,
+          pushPublicKey: urlsafeBase64Encode(subscription.getKey('p256dh')),
+          pushAuthKey: urlsafeBase64Encode(subscription.getKey('auth'))
+        }
+      });
+    })
+    .catch(err => {
+      Log.i("Error when registering FxA push endpoint " + err);
+    });
+  },
+
+  _unsubscribe() {
+    Log.i("FxAccountsPush _unsubscribe");
+    return new Promise((resolve) => {
+      PushService.unsubscribe(FXA_PUSH_SCOPE,
+        Services.scriptSecurityManager.getSystemPrincipal(),
+        (result, ok) => {
+          if (Components.isSuccessCode(result)) {
+            if (ok === true) {
+              Log.d("FxAccountsPush unsubscribed");
+            } else {
+              Log.d("FxAccountsPush had no subscription to unsubscribe");
+            }
+          } else {
+            Log.w("FxAccountsPush failed to unsubscribe", result);
+          }
+          return resolve(ok);
+        });
+    }).catch(err => {
+      Log.e("Error during unsubscribe", err);
+    });
+  },
+
+  _decodePushMessage(data) {
+    Log.i("FxAccountsPush _decodePushMessage");
+    data = JSON.parse(data);
+    let { headers, message } = this._messageAndHeaders(data);
+    return new Promise((resolve, reject) => {
+      PushService.getSubscription(FXA_PUSH_SCOPE,
+        Services.scriptSecurityManager.getSystemPrincipal(),
+        (result, subscription) => {
+          if (!subscription) {
+            return reject(new Error("No subscription found"));
+          }
+          return resolve(subscription);
+        });
+    }).then(subscription => {
+      return PushCrypto.decrypt(subscription.p256dhPrivateKey,
+                                new Uint8Array(subscription.getKey("p256dh")),
+                                new Uint8Array(subscription.getKey("auth")),
+                                headers, message);
+    })
+    .then(plaintext => {
+      let decryptedMessage = plaintext ? _decoder.decode(plaintext) : "";
+      Messaging.sendRequestForResult({
+        type: "FxAccountsPush:ReceivedPushMessageToDecode:Response",
+        message: decryptedMessage
+      });
+    })
+    .catch(err => {
+      Log.d("Error while decoding incoming message : " + err);
+    });
+  },
+
+  // Copied from PushServiceAndroidGCM
+  _messageAndHeaders(data) {
+    // Default is no data (and no encryption).
+    let message = null;
+    let headers = null;
+
+    if (data.message && data.enc && (data.enckey || data.cryptokey)) {
+      headers = {
+        encryption_key: data.enckey,
+        crypto_key: data.cryptokey,
+        encryption: data.enc,
+        encoding: data.con,
+      };
+      // Ciphertext is (urlsafe) Base 64 encoded.
+      message = ChromeUtils.base64URLDecode(data.message, {
+        // The Push server may append padding.
+        padding: "ignore",
+      });
+    }
+    return { headers, message };
+  },
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver]),
+
+  classID: Components.ID("{d1bbb0fd-1d47-4134-9c12-d7b1be20b721}")
+};
+
+function urlsafeBase64Encode(key) {
+  return ChromeUtils.base64URLEncode(new Uint8Array(key), { pad: false });
+}
+
+var components = [ FxAccountsPush ];
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory(components);
diff --git a/mobile/android/components/HelperAppDialog.js b/mobile/android/components/HelperAppDialog.js
new file mode 100644
index 0000000000..f127fb0b3b
--- /dev/null
+++ b/mobile/android/components/HelperAppDialog.js
@@ -0,0 +1,373 @@
+// -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*globals ContentAreaUtils */
+
+const { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
+
+const APK_MIME_TYPE = "application/vnd.android.package-archive";
+
+const OMA_DOWNLOAD_DESCRIPTOR_MIME_TYPE = "application/vnd.oma.dd+xml";
+const OMA_DRM_MESSAGE_MIME = "application/vnd.oma.drm.message";
+const OMA_DRM_CONTENT_MIME = "application/vnd.oma.drm.content";
+const OMA_DRM_RIGHTS_MIME = "application/vnd.oma.drm.rights+wbxml";
+
+const PREF_BD_USEDOWNLOADDIR = "browser.download.useDownloadDir";
+const URI_GENERIC_ICON_DOWNLOAD = "drawable://alert_download";
+
+Cu.import("resource://gre/modules/Downloads.jsm");
+Cu.import("resource://gre/modules/FileUtils.jsm");
+Cu.import("resource://gre/modules/HelperApps.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
+Cu.import("resource://gre/modules/Task.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "RuntimePermissions", "resource://gre/modules/RuntimePermissions.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Messaging", "resource://gre/modules/Messaging.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Snackbars", "resource://gre/modules/Snackbars.jsm");
+
+// -----------------------------------------------------------------------
+// HelperApp Launcher Dialog
+// -----------------------------------------------------------------------
+
+XPCOMUtils.defineLazyGetter(this, "ContentAreaUtils", function() {
+  let ContentAreaUtils = {};
+  Services.scriptloader.loadSubScript("chrome://global/content/contentAreaUtils.js", ContentAreaUtils);
+  return ContentAreaUtils;
+});
+
+function HelperAppLauncherDialog() { }
+
+HelperAppLauncherDialog.prototype = {
+  classID: Components.ID("{e9d277a0-268a-4ec2-bb8c-10fdf3e44611}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIHelperAppLauncherDialog]),
+
+  /**
+   * Returns false if `url` represents a local or special URL that we don't
+   * wish to ever download.
+   *
+   * Returns true otherwise.
+   */
+  _canDownload: function (url, alreadyResolved=false) {
+    // The common case.
+    if (url.schemeIs("http") ||
+        url.schemeIs("https") ||
+        url.schemeIs("ftp")) {
+      return true;
+    }
+
+    // The less-common opposite case.
+    if (url.schemeIs("chrome") ||
+        url.schemeIs("jar") ||
+        url.schemeIs("resource") ||
+        url.schemeIs("wyciwyg") ||
+        url.schemeIs("file")) {
+      return false;
+    }
+
+    // For all other URIs, try to resolve them to an inner URI, and check that.
+    if (!alreadyResolved) {
+      let innerURI = NetUtil.newChannel({
+        uri: url,
+        loadUsingSystemPrincipal: true
+      }).URI;
+
+      if (!url.equals(innerURI)) {
+        return this._canDownload(innerURI, true);
+      }
+    }
+
+    // Anything else is fine to download.
+    return true;
+  },
+
+  /**
+   * Returns true if `launcher` represents a download for which we wish
+   * to prompt.
+   */
+  _shouldPrompt: function (launcher) {
+    let mimeType = this._getMimeTypeFromLauncher(launcher);
+
+    // Straight equality: nsIMIMEInfo normalizes.
+    return APK_MIME_TYPE == mimeType || OMA_DOWNLOAD_DESCRIPTOR_MIME_TYPE == mimeType;
+  },
+
+  /**
+   * Returns true if `launcher` represents a download for which we wish to
+   * offer a "Save to disk" option.
+   */
+  _shouldAddSaveToDiskIntent: function(launcher) {
+      let mimeType = this._getMimeTypeFromLauncher(launcher);
+
+      // We can't handle OMA downloads. So don't even try. (Bug 1219078)
+      return mimeType != OMA_DOWNLOAD_DESCRIPTOR_MIME_TYPE;
+  },
+
+  /**
+   * Returns true if `launcher`represents a download that should not be handled by Firefox
+   * or a third-party app and instead be forwarded to Android's download manager.
+   */
+  _shouldForwardToAndroidDownloadManager: function(aLauncher) {
+    let forwardDownload = Services.prefs.getBoolPref('browser.download.forward_oma_android_download_manager');
+    if (!forwardDownload) {
+      return false;
+    }
+
+    let mimeType = aLauncher.MIMEInfo.MIMEType;
+    if (!mimeType) {
+      mimeType = ContentAreaUtils.getMIMETypeForURI(aLauncher.source) || "";
+    }
+
+    return [
+      OMA_DOWNLOAD_DESCRIPTOR_MIME_TYPE,
+      OMA_DRM_MESSAGE_MIME,
+      OMA_DRM_CONTENT_MIME,
+      OMA_DRM_RIGHTS_MIME
+    ].indexOf(mimeType) != -1;
+  },
+
+  show: function hald_show(aLauncher, aContext, aReason) {
+    if (!this._canDownload(aLauncher.source)) {
+      this._refuseDownload(aLauncher);
+      return;
+    }
+
+    if (this._shouldForwardToAndroidDownloadManager(aLauncher)) {
+      Task.spawn(function* () {
+        try {
+          let hasPermission = yield RuntimePermissions.waitForPermissions(RuntimePermissions.WRITE_EXTERNAL_STORAGE);
+          if (hasPermission) {
+            this._downloadWithAndroidDownloadManager(aLauncher);
+            aLauncher.cancel(Cr.NS_BINDING_ABORTED);
+          }
+        } finally {
+        }
+      }.bind(this)).catch(Cu.reportError);
+      return;
+    }
+
+    let bundle = Services.strings.createBundle("chrome://browser/locale/browser.properties");
+
+    let defaultHandler = new Object();
+    let apps = HelperApps.getAppsForUri(aLauncher.source, {
+      mimeType: aLauncher.MIMEInfo.MIMEType,
+    });
+
+    if (this._shouldAddSaveToDiskIntent(aLauncher)) {
+      // Add a fake intent for save to disk at the top of the list.
+      apps.unshift({
+        name: bundle.GetStringFromName("helperapps.saveToDisk"),
+        packageName: "org.mozilla.gecko.Download",
+        iconUri: "drawable://icon",
+        selected: true, // Default to download for files
+        launch: function() {
+          // Reset the preferredAction here.
+          aLauncher.MIMEInfo.preferredAction = Ci.nsIMIMEInfo.saveToDisk;
+          aLauncher.saveToDisk(null, false);
+          return true;
+        }
+      });
+    }
+
+    // We do not handle this download and there are no apps that want to do it
+    if (apps.length === 0) {
+      this._refuseDownload(aLauncher);
+      return;
+    }
+
+    let callback = function(app) {
+      aLauncher.MIMEInfo.preferredAction = Ci.nsIMIMEInfo.useHelperApp;
+      if (!app.launch(aLauncher.source)) {
+        // Once the app is done we need to get rid of the temp file. This shouldn't
+        // get run in the saveToDisk case.
+        aLauncher.cancel(Cr.NS_BINDING_ABORTED);
+      }
+    }
+
+    // See if the user already marked something as the default for this mimetype,
+    // and if that app is still installed.
+    let preferredApp = this._getPreferredApp(aLauncher);
+    if (preferredApp) {
+      let pref = apps.filter(function(app) {
+        return app.packageName === preferredApp;
+      });
+
+      if (pref.length > 0) {
+        callback(pref[0]);
+        return;
+      }
+    }
+
+    // If there's only one choice, and we don't want to prompt, go right ahead
+    // and choose that app automatically.
+    if (!this._shouldPrompt(aLauncher) && (apps.length === 1)) {
+      callback(apps[0]);
+      return;
+    }
+
+    // Otherwise, let's go through the prompt.
+    HelperApps.prompt(apps, {
+      title: bundle.GetStringFromName("helperapps.pick"),
+      buttons: [
+        bundle.GetStringFromName("helperapps.alwaysUse"),
+        bundle.GetStringFromName("helperapps.useJustOnce")
+      ],
+      // Tapping an app twice should choose "Just once".
+      doubleTapButton: 1
+    }, (data) => {
+      if (data.button < 0) {
+        return;
+      }
+
+      callback(apps[data.icongrid0]);
+
+      if (data.button === 0) {
+        this._setPreferredApp(aLauncher, apps[data.icongrid0]);
+      }
+    });
+  },
+
+  _refuseDownload: function(aLauncher) {
+    aLauncher.cancel(Cr.NS_BINDING_ABORTED);
+
+    Services.console.logStringMessage("Refusing download of non-downloadable file.");
+
+    let bundle = Services.strings.createBundle("chrome://browser/locale/handling.properties");
+    let failedText = bundle.GetStringFromName("download.blocked");
+
+    Snackbars.show(failedText, Snackbars.LENGTH_LONG);
+  },
+
+  _downloadWithAndroidDownloadManager(aLauncher) {
+    let mimeType = aLauncher.MIMEInfo.MIMEType;
+    if (!mimeType) {
+      mimeType = ContentAreaUtils.getMIMETypeForURI(aLauncher.source) || "";
+    }
+
+    Messaging.sendRequest({
+      'type': 'Download:AndroidDownloadManager',
+      'uri': aLauncher.source.spec,
+      'mimeType': mimeType,
+      'filename': aLauncher.suggestedFileName
+    });
+  },
+
+  _getPrefName: function getPrefName(mimetype) {
+    return "browser.download.preferred." + mimetype.replace("\\", ".");
+  },
+
+  _getMimeTypeFromLauncher: function (launcher) {
+    let mime = launcher.MIMEInfo.MIMEType;
+    if (!mime)
+      mime = ContentAreaUtils.getMIMETypeForURI(launcher.source) || "";
+    return mime;
+  },
+
+  _getPreferredApp: function getPreferredApp(launcher) {
+    let mime = this._getMimeTypeFromLauncher(launcher);
+    if (!mime)
+      return;
+
+    try {
+      return Services.prefs.getCharPref(this._getPrefName(mime));
+    } catch(ex) {
+      Services.console.logStringMessage("Error getting pref for " + mime + ".");
+    }
+    return null;
+  },
+
+  _setPreferredApp: function setPreferredApp(launcher, app) {
+    let mime = this._getMimeTypeFromLauncher(launcher);
+    if (!mime)
+      return;
+
+    if (app)
+      Services.prefs.setCharPref(this._getPrefName(mime), app.packageName);
+    else
+      Services.prefs.clearUserPref(this._getPrefName(mime));
+  },
+
+  promptForSaveToFileAsync: function (aLauncher, aContext, aDefaultFile,
+                                      aSuggestedFileExt, aForcePrompt) {
+    Task.spawn(function* () {
+      let file = null;
+      try {
+        let hasPermission = yield RuntimePermissions.waitForPermissions(RuntimePermissions.WRITE_EXTERNAL_STORAGE);
+        if (hasPermission) {
+          // If we do have the STORAGE permission then pick the public downloads directory as destination
+          // for this file. Without the permission saveDestinationAvailable(null) will be called which
+          // will effectively cancel the download.
+          let preferredDir = yield Downloads.getPreferredDownloadsDirectory();
+          file = this.validateLeafName(new FileUtils.File(preferredDir),
+                                       aDefaultFile, aSuggestedFileExt);
+        }
+      } finally {
+        // The file argument will be null in case any exception occurred.
+        aLauncher.saveDestinationAvailable(file);
+      }
+    }.bind(this)).catch(Cu.reportError);
+  },
+
+  validateLeafName: function hald_validateLeafName(aLocalFile, aLeafName, aFileExt) {
+    if (!(aLocalFile && this.isUsableDirectory(aLocalFile)))
+      return null;
+
+    // Remove any leading periods, since we don't want to save hidden files
+    // automatically.
+    aLeafName = aLeafName.replace(/^\.+/, "");
+
+    if (aLeafName == "")
+      aLeafName = "unnamed" + (aFileExt ? "." + aFileExt : "");
+    aLocalFile.append(aLeafName);
+
+    this.makeFileUnique(aLocalFile);
+    return aLocalFile;
+  },
+
+  makeFileUnique: function hald_makeFileUnique(aLocalFile) {
+    try {
+      // Note - this code is identical to that in
+      //   toolkit/content/contentAreaUtils.js.
+      // If you are updating this code, update that code too! We can't share code
+      // here since this is called in a js component.
+      let collisionCount = 0;
+      while (aLocalFile.exists()) {
+        collisionCount++;
+        if (collisionCount == 1) {
+          // Append "(2)" before the last dot in (or at the end of) the filename
+          // special case .ext.gz etc files so we don't wind up with .tar(2).gz
+          if (aLocalFile.leafName.match(/\.[^\.]{1,3}\.(gz|bz2|Z)$/i))
+            aLocalFile.leafName = aLocalFile.leafName.replace(/\.[^\.]{1,3}\.(gz|bz2|Z)$/i, "(2)$&");
+          else
+            aLocalFile.leafName = aLocalFile.leafName.replace(/(\.[^\.]*)?$/, "(2)$&");
+        }
+        else {
+          // replace the last (n) in the filename with (n+1)
+          aLocalFile.leafName = aLocalFile.leafName.replace(/^(.*\()\d+\)/, "$1" + (collisionCount+1) + ")");
+        }
+      }
+      aLocalFile.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);
+    }
+    catch (e) {
+      dump("*** exception in validateLeafName: " + e + "\n");
+
+      if (e.result == Cr.NS_ERROR_FILE_ACCESS_DENIED)
+        throw e;
+
+      if (aLocalFile.leafName == "" || aLocalFile.isDirectory()) {
+        aLocalFile.append("unnamed");
+        if (aLocalFile.exists())
+          aLocalFile.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);
+      }
+    }
+  },
+
+  isUsableDirectory: function hald_isUsableDirectory(aDirectory) {
+    return aDirectory.exists() && aDirectory.isDirectory() && aDirectory.isWritable();
+  },
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([HelperAppLauncherDialog]);
diff --git a/mobile/android/components/ImageBlockingPolicy.js b/mobile/android/components/ImageBlockingPolicy.js
new file mode 100644
index 0000000000..2444bda066
--- /dev/null
+++ b/mobile/android/components/ImageBlockingPolicy.js
@@ -0,0 +1,125 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const { classes: Cc, interfaces: Ci, manager: Cm, utils: Cu, results: Cr } = Components;
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Timer.jsm");
+
+////////////////////////////////////////////////////////////////////////////////
+//// Constants
+
+//// SVG placeholder image for blocked image content
+const PLACEHOLDER_IMG = "chrome://browser/skin/images/placeholder_image.svg";
+
+//// Telemetry
+const TELEMETRY_TAP_TO_LOAD_ENABLED = "TAP_TO_LOAD_ENABLED";
+const TELEMETRY_SHOW_IMAGE_SIZE = "TAP_TO_LOAD_IMAGE_SIZE";
+const TOPIC_GATHER_TELEMETRY = "gather-telemetry";
+
+//// Gecko preference
+const PREF_IMAGEBLOCKING = "browser.image_blocking";
+
+//// Enabled options
+const OPTION_NEVER = 0;
+const OPTION_ALWAYS = 1;
+const OPTION_WIFI_ONLY = 2;
+
+
+/**
+ * Content policy for blocking images
+ */
+function ImageBlockingPolicy() {
+  Services.obs.addObserver(this, TOPIC_GATHER_TELEMETRY, false);
+}
+
+ImageBlockingPolicy.prototype = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIContentPolicy, Ci.nsIObserver]),
+  classDescription: "Click-To-Play Image",
+  classID: Components.ID("{f55f77f9-d33d-4759-82fc-60db3ee0bb91}"),
+  contractID: "@mozilla.org/browser/blockimages-policy;1",
+  xpcom_categories: [{category: "content-policy", service: true}],
+
+  // nsIContentPolicy interface implementation
+  shouldLoad: function(contentType, contentLocation, requestOrigin, node, mimeTypeGuess, extra) {
+    // When enabled or when on cellular, and option for cellular-only is selected
+    if (this._enabled() == OPTION_NEVER || (this._enabled() == OPTION_WIFI_ONLY && this._usingCellular())) {
+      if (contentType === Ci.nsIContentPolicy.TYPE_IMAGE || contentType === Ci.nsIContentPolicy.TYPE_IMAGESET) {
+        // Accept any non-http(s) image URLs
+        if (!contentLocation.schemeIs("http") && !contentLocation.schemeIs("https")) {
+          return Ci.nsIContentPolicy.ACCEPT;
+        }
+
+        if (node instanceof Ci.nsIDOMHTMLImageElement) {
+          // Accept if the user has asked to view the image
+          if (node.getAttribute("data-ctv-show") == "true") {
+            sendImageSizeTelemetry(node.getAttribute("data-ctv-src"));
+            return Ci.nsIContentPolicy.ACCEPT;
+          }
+
+          setTimeout(() => {
+            // Cache the original image URL and swap in our placeholder
+            node.setAttribute("data-ctv-src", contentLocation.spec);
+            node.setAttribute("src", PLACEHOLDER_IMG);
+
+            // For imageset (img + srcset) the "srcset" is used even after we reset the "src" causing a loop.
+            // We are given the final image URL anyway, so it's OK to just remove the "srcset" value.
+            node.removeAttribute("srcset");
+          }, 0);
+        }
+
+        // Reject any image that is not associated with a DOM element
+        return Ci.nsIContentPolicy.REJECT;
+      }
+    }
+
+    // Accept all other content types
+    return Ci.nsIContentPolicy.ACCEPT;
+  },
+
+  shouldProcess: function(contentType, contentLocation, requestOrigin, node, mimeTypeGuess, extra) {
+    return Ci.nsIContentPolicy.ACCEPT;
+  },
+
+  _usingCellular: function() {
+    let network = Cc["@mozilla.org/network/network-link-service;1"].getService(Ci.nsINetworkLinkService);
+    return !(network.linkType == Ci.nsINetworkLinkService.LINK_TYPE_UNKNOWN ||
+        network.linkType == Ci.nsINetworkLinkService.LINK_TYPE_ETHERNET ||
+        network.linkType == Ci.nsINetworkLinkService.LINK_TYPE_USB  ||
+        network.linkType == Ci.nsINetworkLinkService.LINK_TYPE_WIFI);
+  },
+
+  _enabled: function() {
+    return Services.prefs.getIntPref(PREF_IMAGEBLOCKING);
+  },
+
+  observe : function (subject, topic, data) {
+    if (topic == TOPIC_GATHER_TELEMETRY) {
+      Services.telemetry.getHistogramById(TELEMETRY_TAP_TO_LOAD_ENABLED).add(this._enabled());
+    }
+  },
+};
+
+function sendImageSizeTelemetry(imageURL) {
+  let xhr = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest);
+  xhr.open("HEAD", imageURL, true);
+  xhr.onreadystatechange = function (e) {
+    if (xhr.readyState != 4) {
+      return;
+    }
+    if (xhr.status != 200) {
+      return;
+    }
+    let contentLength = xhr.getResponseHeader("Content-Length");
+    if (!contentLength) {
+      return;
+    }
+    let imageSize = contentLength / 1024;
+    Services.telemetry.getHistogramById(TELEMETRY_SHOW_IMAGE_SIZE).add(imageSize);
+  };
+  xhr.send(null);
+}
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([ImageBlockingPolicy]);
diff --git a/mobile/android/components/LoginManagerPrompter.js b/mobile/android/components/LoginManagerPrompter.js
new file mode 100644
index 0000000000..e70afbe147
--- /dev/null
+++ b/mobile/android/components/LoginManagerPrompter.js
@@ -0,0 +1,413 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this
+* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cr = Components.results;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+/* Constants for password prompt telemetry.
+* Mirrored in nsLoginManagerPrompter.js */
+const PROMPT_DISPLAYED = 0;
+
+const PROMPT_ADD = 1;
+const PROMPT_NOTNOW = 2;
+const PROMPT_NEVER = 3;
+
+const PROMPT_UPDATE = 1;
+
+/* ==================== LoginManagerPrompter ==================== */
+/*
+ * LoginManagerPrompter
+ *
+ * Implements interfaces for prompting the user to enter/save/change auth info.
+ *
+ * nsILoginManagerPrompter: Used by Login Manager for saving/changing logins
+ * found in HTML forms.
+ */
+function LoginManagerPrompter() {
+}
+
+LoginManagerPrompter.prototype = {
+  classID : Components.ID("97d12931-abe2-11df-94e2-0800200c9a66"),
+  QueryInterface : XPCOMUtils.generateQI([Ci.nsILoginManagerPrompter]),
+
+  _factory       : null,
+  _window       : null,
+  _debug         : false, // mirrors signon.debug
+
+  __pwmgr : null, // Password Manager service
+  get _pwmgr() {
+    if (!this.__pwmgr)
+      this.__pwmgr = Cc["@mozilla.org/login-manager;1"].
+                     getService(Ci.nsILoginManager);
+    return this.__pwmgr;
+  },
+
+  __promptService : null, // Prompt service for user interaction
+  get _promptService() {
+    if (!this.__promptService)
+      this.__promptService = Cc["@mozilla.org/embedcomp/prompt-service;1"].
+                             getService(Ci.nsIPromptService2);
+    return this.__promptService;
+  },
+
+  __strBundle : null, // String bundle for L10N
+  get _strBundle() {
+    if (!this.__strBundle) {
+      let bunService = Cc["@mozilla.org/intl/stringbundle;1"].
+                       getService(Ci.nsIStringBundleService);
+      this.__strBundle = {
+        pwmgr : bunService.createBundle("chrome://passwordmgr/locale/passwordmgr.properties"),
+        brand : bunService.createBundle("chrome://branding/locale/brand.properties")
+      };
+
+      if (!this.__strBundle)
+        throw "String bundle for Login Manager not present!";
+    }
+
+    return this.__strBundle;
+  },
+
+  __ellipsis : null,
+  get _ellipsis() {
+  if (!this.__ellipsis) {
+    this.__ellipsis = "\u2026";
+    try {
+      this.__ellipsis = Services.prefs.getComplexValue(
+                        "intl.ellipsis", Ci.nsIPrefLocalizedString).data;
+    } catch (e) { }
+  }
+  return this.__ellipsis;
+  },
+
+  /*
+   * log
+   *
+   * Internal function for logging debug messages to the Error Console window.
+   */
+  log : function (message) {
+    if (!this._debug)
+      return;
+
+    dump("Pwmgr Prompter: " + message + "\n");
+    Services.console.logStringMessage("Pwmgr Prompter: " + message);
+  },
+
+  /* ---------- nsILoginManagerPrompter prompts ---------- */
+
+  /*
+   * init
+   *
+   */
+  init : function (aWindow, aFactory) {
+    this._chromeWindow = this._getChromeWindow(aWindow).wrappedJSObject;
+    this._factory = aFactory || null;
+    this._browser = null;
+
+    var prefBranch = Services.prefs.getBranch("signon.");
+    this._debug = prefBranch.getBoolPref("debug");
+    this.log("===== initialized =====");
+  },
+
+  set browser(aBrowser) {
+    this._browser = aBrowser;
+  },
+
+  // setting this attribute is ignored because Android does not consider
+  // opener windows when displaying login notifications
+  set opener(aOpener) { },
+
+  /*
+   * promptToSavePassword
+   *
+   */
+  promptToSavePassword : function (aLogin) {
+    this._showSaveLoginNotification(aLogin);
+      Services.telemetry.getHistogramById("PWMGR_PROMPT_REMEMBER_ACTION").add(PROMPT_DISPLAYED);
+    Services.obs.notifyObservers(aLogin, "passwordmgr-prompt-save", null);
+  },
+
+  /*
+   * _showLoginNotification
+   *
+   * Displays a notification doorhanger.
+   * @param aBody
+   *        String message to be displayed in the doorhanger
+   * @param aButtons
+   *        Buttons to display with the doorhanger
+   * @param aUsername
+   *        Username string used in creating a doorhanger action
+   * @param aPassword
+   *        Password string used in creating a doorhanger action
+   */
+  _showLoginNotification : function (aBody, aButtons, aUsername, aPassword) {
+    let tabID = this._chromeWindow.BrowserApp.getTabForBrowser(this._browser).id;
+
+    let actionText = {
+      text: aUsername,
+      type: "EDIT",
+      bundle: { username: aUsername,
+      password: aPassword }
+    };
+
+    // The page we're going to hasn't loaded yet, so we want to persist
+    // across the first location change.
+
+    // Sites like Gmail perform a funky redirect dance before you end up
+    // at the post-authentication page. I don't see a good way to
+    // heuristically determine when to ignore such location changes, so
+    // we'll try ignoring location changes based on a time interval.
+    let options = {
+      persistWhileVisible: true,
+      timeout: Date.now() + 10000,
+      actionText: actionText
+    }
+
+    var nativeWindow = this._getNativeWindow();
+    if (nativeWindow)
+      nativeWindow.doorhanger.show(aBody, "password", aButtons, tabID, options, "LOGIN");
+  },
+
+  /*
+   * _showSaveLoginNotification
+   *
+   * Displays a notification doorhanger (rather than a popup), to allow the user to
+   * save the specified login. This allows the user to see the results of
+   * their login, and only save a login which they know worked.
+   *
+   */
+  _showSaveLoginNotification : function (aLogin) {
+    let brandShortName = this._strBundle.brand.GetStringFromName("brandShortName");
+    let notificationText  = this._getLocalizedString("saveLogin", [brandShortName]);
+
+    let username = aLogin.username ? this._sanitizeUsername(aLogin.username) : "";
+
+    // The callbacks in |buttons| have a closure to access the variables
+    // in scope here; set one to |this._pwmgr| so we can get back to pwmgr
+    // without a getService() call.
+    var pwmgr = this._pwmgr;
+    let promptHistogram = Services.telemetry.getHistogramById("PWMGR_PROMPT_REMEMBER_ACTION");
+
+    var buttons = [
+      {
+        label: this._getLocalizedString("neverButton"),
+        callback: function() {
+          promptHistogram.add(PROMPT_NEVER);
+          pwmgr.setLoginSavingEnabled(aLogin.hostname, false);
+        }
+      },
+      {
+        label: this._getLocalizedString("rememberButton"),
+        callback: function(checked, response) {
+          if (response) {
+            aLogin.username = response["username"] || aLogin.username;
+            aLogin.password = response["password"] || aLogin.password;
+          }
+          pwmgr.addLogin(aLogin);
+          promptHistogram.add(PROMPT_ADD);
+        },
+        positive: true
+      }
+    ];
+
+    this._showLoginNotification(notificationText, buttons, aLogin.username, aLogin.password);
+  },
+
+  /*
+   * promptToChangePassword
+   *
+   * Called when we think we detect a password change for an existing
+   * login, when the form being submitted contains multiple password
+   * fields.
+   *
+   */
+  promptToChangePassword : function (aOldLogin, aNewLogin) {
+    this._showChangeLoginNotification(aOldLogin, aNewLogin.password);
+    Services.telemetry.getHistogramById("PWMGR_PROMPT_UPDATE_ACTION").add(PROMPT_DISPLAYED);
+    let oldGUID = aOldLogin.QueryInterface(Ci.nsILoginMetaInfo).guid;
+    Services.obs.notifyObservers(aNewLogin, "passwordmgr-prompt-change", oldGUID);
+  },
+
+  /*
+   * _showChangeLoginNotification
+   *
+   * Shows the Change Password notification doorhanger.
+   *
+   */
+  _showChangeLoginNotification : function (aOldLogin, aNewPassword) {
+    var notificationText;
+    if (aOldLogin.username) {
+      let displayUser = this._sanitizeUsername(aOldLogin.username);
+      notificationText  = this._getLocalizedString("updatePassword", [displayUser]);
+    } else {
+      notificationText  = this._getLocalizedString("updatePasswordNoUser");
+    }
+
+    // The callbacks in |buttons| have a closure to access the variables
+    // in scope here; set one to |this._pwmgr| so we can get back to pwmgr
+    // without a getService() call.
+    var self = this;
+    let promptHistogram = Services.telemetry.getHistogramById("PWMGR_PROMPT_UPDATE_ACTION");
+
+    var buttons = [
+      {
+        label: this._getLocalizedString("dontUpdateButton"),
+        callback:  function() {
+          promptHistogram.add(PROMPT_NOTNOW);
+          // do nothing
+        }
+      },
+      {
+        label: this._getLocalizedString("updateButton"),
+        callback:  function(checked, response) {
+          let password = response ? response["password"] : aNewPassword;
+          self._updateLogin(aOldLogin, password);
+
+          promptHistogram.add(PROMPT_UPDATE);
+        },
+        positive: true
+      }
+    ];
+
+    this._showLoginNotification(notificationText, buttons, aOldLogin.username, aNewPassword);
+  },
+
+  /*
+   * promptToChangePasswordWithUsernames
+   *
+   * Called when we detect a password change in a form submission, but we
+   * don't know which existing login (username) it's for. Asks the user
+   * to select a username and confirm the password change.
+   *
+   * Note: The caller doesn't know the username for aNewLogin, so this
+   *       function fills in .username and .usernameField with the values
+   *       from the login selected by the user.
+   * 
+   * Note; XPCOM stupidity: |count| is just |logins.length|.
+   */
+  promptToChangePasswordWithUsernames : function (logins, count, aNewLogin) {
+    const buttonFlags = Ci.nsIPrompt.STD_YES_NO_BUTTONS;
+
+    var usernames = logins.map(l => l.username);
+    var dialogText  = this._getLocalizedString("userSelectText");
+    var dialogTitle = this._getLocalizedString("passwordChangeTitle");
+    var selectedIndex = { value: null };
+
+    // If user selects ok, outparam.value is set to the index
+    // of the selected username.
+    var ok = this._promptService.select(null,
+      dialogTitle, dialogText,
+      usernames.length, usernames,
+      selectedIndex);
+    if (ok) {
+      // Now that we know which login to use, modify its password.
+      let selectedLogin = logins[selectedIndex.value];
+      this.log("Updating password for user " + selectedLogin.username);
+      this._updateLogin(selectedLogin, aNewLogin.password);
+    }
+  },
+
+  /* ---------- Internal Methods ---------- */
+
+  /*
+   * _updateLogin
+   */
+  _updateLogin : function (login, newPassword) {
+    var now = Date.now();
+    var propBag = Cc["@mozilla.org/hash-property-bag;1"].
+      createInstance(Ci.nsIWritablePropertyBag);
+    if (newPassword) {
+      propBag.setProperty("password", newPassword);
+      // Explicitly set the password change time here (even though it would
+      // be changed automatically), to ensure that it's exactly the same
+      // value as timeLastUsed.
+      propBag.setProperty("timePasswordChanged", now);
+    }
+    propBag.setProperty("timeLastUsed", now);
+    propBag.setProperty("timesUsedIncrement", 1);
+    this._pwmgr.modifyLogin(login, propBag);
+  },
+
+  /*
+   * _getChromeWindow
+   *
+   * Given a content DOM window, returns the chrome window it's in.
+   */
+  _getChromeWindow: function (aWindow) {
+    if (aWindow instanceof Ci.nsIDOMChromeWindow)
+      return aWindow;
+    var chromeWin = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+      .getInterface(Ci.nsIWebNavigation)
+      .QueryInterface(Ci.nsIDocShell)
+      .chromeEventHandler.ownerDocument.defaultView;
+    return chromeWin;
+  },
+
+  /*
+   * _getNativeWindow
+   *
+   * Returns the NativeWindow to this prompter, or null if there isn't
+   * a NativeWindow available (w/ error sent to logcat).
+   */
+  _getNativeWindow : function () {
+    let nativeWindow = null;
+    try {
+      let chromeWin = this._chromeWindow;
+      if (chromeWin.NativeWindow) {
+        nativeWindow = chromeWin.NativeWindow;
+      } else {
+        Cu.reportError("NativeWindow not available on window");
+      }
+
+    } catch (e) {
+      // If any errors happen, just assume no native window helper.
+      Cu.reportError("No NativeWindow available: " + e);
+    }
+    return nativeWindow;
+  },
+
+  /*
+   * _getLocalizedString
+   *
+   * Can be called as:
+   *   _getLocalizedString("key1");
+   *   _getLocalizedString("key2", ["arg1"]);
+   *   _getLocalizedString("key3", ["arg1", "arg2"]);
+   *   (etc)
+   *
+   * Returns the localized string for the specified key,
+   * formatted if required.
+   *
+   */ 
+  _getLocalizedString : function (key, formatArgs) {
+    if (formatArgs)
+      return this._strBundle.pwmgr.formatStringFromName(
+        key, formatArgs, formatArgs.length);
+    else
+      return this._strBundle.pwmgr.GetStringFromName(key);
+  },
+
+  /*
+   * _sanitizeUsername
+   *
+   * Sanitizes the specified username, by stripping quotes and truncating if
+   * it's too long. This helps prevent an evil site from messing with the
+   * "save password?" prompt too much.
+   */
+  _sanitizeUsername : function (username) {
+    if (username.length > 30) {
+      username = username.substring(0, 30);
+      username += this._ellipsis;
+    }
+    return username.replace(/['"]/g, "");
+  },
+}; // end of LoginManagerPrompter implementation
+
+
+var component = [LoginManagerPrompter];
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory(component);
diff --git a/mobile/android/components/MobileComponents.manifest b/mobile/android/components/MobileComponents.manifest
new file mode 100644
index 0000000000..8cf8f9a27e
--- /dev/null
+++ b/mobile/android/components/MobileComponents.manifest
@@ -0,0 +1,126 @@
+# AboutRedirector.js
+component {322ba47e-7047-4f71-aebf-cb7d69325cd9} AboutRedirector.js
+contract @mozilla.org/network/protocol/about;1?what= {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=fennec {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=firefox {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=empty {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=rights {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=certerror {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=home {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=downloads {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=reader {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=feedback {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=privatebrowsing {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+#ifdef MOZ_SERVICES_HEALTHREPORT
+contract @mozilla.org/network/protocol/about;1?what=healthreport {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+#endif
+contract @mozilla.org/network/protocol/about;1?what=blocked {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=accounts {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+contract @mozilla.org/network/protocol/about;1?what=logins {322ba47e-7047-4f71-aebf-cb7d69325cd9}
+
+# DirectoryProvider.js
+component {ef0f7a87-c1ee-45a8-8d67-26f586e46a4b} DirectoryProvider.js
+contract @mozilla.org/browser/directory-provider;1 {ef0f7a87-c1ee-45a8-8d67-26f586e46a4b}
+category xpcom-directory-providers browser-directory-provider @mozilla.org/browser/directory-provider;1
+
+# stylesheets
+category agent-style-sheets browser-content-stylesheet chrome://browser/skin/content.css
+
+# SessionStore.js
+component {8c1f07d6-cba3-4226-a315-8bd43d67d032} SessionStore.js
+contract @mozilla.org/browser/sessionstore;1 {8c1f07d6-cba3-4226-a315-8bd43d67d032}
+category app-startup SessionStore service,@mozilla.org/browser/sessionstore;1
+
+# ContentPermissionPrompt.js
+component {C6E8C44D-9F39-4AF7-BCC0-76E38A8310F5} ContentPermissionPrompt.js
+contract @mozilla.org/content-permission/prompt;1 {C6E8C44D-9F39-4AF7-BCC0-76E38A8310F5}
+
+# PromptService.js
+component {9a61149b-2276-4a0a-b79c-be994ad106cf} PromptService.js
+contract @mozilla.org/prompter;1 {9a61149b-2276-4a0a-b79c-be994ad106cf}
+contract @mozilla.org/embedcomp/prompt-service;1 {9a61149b-2276-4a0a-b79c-be994ad106cf}
+component {80dae1e9-e0d2-4974-915f-f97050fa8068} PromptService.js
+contract @mozilla.org/network/authprompt-adapter-factory;1 {80dae1e9-e0d2-4974-915f-f97050fa8068}
+
+# PresentationDevicePrompt.js
+component {388bd149-c919-4a43-b646-d7ec57877689} PresentationDevicePrompt.js
+contract @mozilla.org/presentation-device/prompt;1 {388bd149-c919-4a43-b646-d7ec57877689}
+
+# PresentationRequestUIGlue.js
+component {9c550ef7-3ff6-4bd1-9ad1-5a3735b90d21} PresentationRequestUIGlue.js
+contract @mozilla.org/presentation/requestuiglue;1 {9c550ef7-3ff6-4bd1-9ad1-5a3735b90d21}
+
+# ImageBlockingPolicy.js
+component {f55f77f9-d33d-4759-82fc-60db3ee0bb91} ImageBlockingPolicy.js
+contract @mozilla.org/browser/blockimages-policy;1 {f55f77f9-d33d-4759-82fc-60db3ee0bb91}
+category content-policy ImageBlockingPolicy @mozilla.org/browser/blockimages-policy;1
+
+# XPIDialogService.js
+component {c1242012-27d8-477e-a0f1-0b098ffc329b} XPIDialogService.js
+contract @mozilla.org/addons/web-install-prompt;1 {c1242012-27d8-477e-a0f1-0b098ffc329b}
+
+# HelperAppDialog.js
+component {e9d277a0-268a-4ec2-bb8c-10fdf3e44611} HelperAppDialog.js
+contract @mozilla.org/helperapplauncherdialog;1 {e9d277a0-268a-4ec2-bb8c-10fdf3e44611}
+
+# BrowserCLH.js
+component {be623d20-d305-11de-8a39-0800200c9a66} BrowserCLH.js application={aa3c5121-dab2-40e2-81ca-7ea25febc110}
+contract @mozilla.org/browser/browser-clh;1 {be623d20-d305-11de-8a39-0800200c9a66}
+category app-startup BrowserCLH @mozilla.org/browser/browser-clh;1
+
+# ContentDispatchChooser.js
+component {5a072a22-1e66-4100-afc1-07aed8b62fc5} ContentDispatchChooser.js
+contract @mozilla.org/content-dispatch-chooser;1 {5a072a22-1e66-4100-afc1-07aed8b62fc5}
+
+# AddonUpdateService.js
+component {93c8824c-9b87-45ae-bc90-5b82a1e4d877} AddonUpdateService.js
+contract @mozilla.org/browser/addon-update-service;1 {93c8824c-9b87-45ae-bc90-5b82a1e4d877}
+category update-timer AddonUpdateService @mozilla.org/browser/addon-update-service;1,getService,auto-addon-background-update-timer,extensions.autoupdate.interval,86400
+
+# LoginManagerPrompter.js
+component {97d12931-abe2-11df-94e2-0800200c9a66} LoginManagerPrompter.js
+contract @mozilla.org/login-manager/prompter;1 {97d12931-abe2-11df-94e2-0800200c9a66}
+
+# BlocklistPrompt.js
+component {4e6ea350-b09a-11df-94e2-0800200c9a66} BlocklistPrompt.js
+contract @mozilla.org/addons/blocklist-prompt;1 {4e6ea350-b09a-11df-94e2-0800200c9a66}
+
+# NSSDialogService.js
+component {cbc08081-49b6-4561-9c18-a7707a50bda1} NSSDialogService.js
+contract @mozilla.org/nsCertificateDialogs;1 {cbc08081-49b6-4561-9c18-a7707a50bda1}
+contract @mozilla.org/nsClientAuthDialogs;1 {cbc08081-49b6-4561-9c18-a7707a50bda1}
+
+# SiteSpecificUserAgent.js
+component {d5234c9d-0ee2-4b3c-9da3-18be9e5cf7e6} SiteSpecificUserAgent.js
+contract @mozilla.org/dom/site-specific-user-agent;1 {d5234c9d-0ee2-4b3c-9da3-18be9e5cf7e6}
+
+# FilePicker.js
+component {18a4e042-7c7c-424b-a583-354e68553a7f} FilePicker.js
+contract @mozilla.org/filepicker;1 {18a4e042-7c7c-424b-a583-354e68553a7f}
+
+# FxAccountsPush.js
+component {d1bbb0fd-1d47-4134-9c12-d7b1be20b721} FxAccountsPush.js
+contract @mozilla.org/fxa-push;1 {d1bbb0fd-1d47-4134-9c12-d7b1be20b721}
+category android-push-service FxAccountsPush @mozilla.org/fxa-push;1
+
+#ifndef RELEASE_OR_BETA
+# TabSource.js
+component {5850c76e-b916-4218-b99a-31f004e0a7e7} TabSource.js
+contract @mozilla.org/tab-source-service;1 {5850c76e-b916-4218-b99a-31f004e0a7e7}
+#endif
+
+# Snippets.js
+component {a78d7e59-b558-4321-a3d6-dffe2f1e76dd} Snippets.js
+contract @mozilla.org/snippets;1 {a78d7e59-b558-4321-a3d6-dffe2f1e76dd}
+category browser-delayed-startup-finished Snippets @mozilla.org/snippets;1
+category update-timer Snippets @mozilla.org/snippets;1,getService,snippets-update-timer,browser.snippets.updateInterval,86400
+
+# ColorPicker.js
+component {430b987f-bb9f-46a3-99a5-241749220b29} ColorPicker.js
+contract @mozilla.org/colorpicker;1 {430b987f-bb9f-46a3-99a5-241749220b29}
+
+# PersistentNotificationHandler.js
+component {75390fe7-f8a3-423a-b3b1-258d7eabed40} PersistentNotificationHandler.js
+contract @mozilla.org/persistent-notification-handler;1 {75390fe7-f8a3-423a-b3b1-258d7eabed40}
+category persistent-notification-click PersistentNotificationHandler @mozilla.org/persistent-notification-handler;1
+category persistent-notification-close PersistentNotificationHandler @mozilla.org/persistent-notification-handler;1
diff --git a/mobile/android/components/NSSDialogService.js b/mobile/android/components/NSSDialogService.js
new file mode 100644
index 0000000000..671cc8c351
--- /dev/null
+++ b/mobile/android/components/NSSDialogService.js
@@ -0,0 +1,276 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+const Cc = Components.classes;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Prompt",
+                                  "resource://gre/modules/Prompt.jsm");
+
+// -----------------------------------------------------------------------
+// NSS Dialog Service
+// -----------------------------------------------------------------------
+
+function NSSDialogs() { }
+
+NSSDialogs.prototype = {
+  classID: Components.ID("{cbc08081-49b6-4561-9c18-a7707a50bda1}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsICertificateDialogs, Ci.nsIClientAuthDialogs]),
+
+  /**
+   * Escapes the given input via HTML entity encoding. Used to prevent HTML
+   * injection when the input is to be placed inside an HTML body, but not in
+   * any other context.
+   *
+   * @param {String} input The input to interpret as a plain string.
+   * @returns {String} The escaped input.
+   */
+  escapeHTML: function(input) {
+    return input.replace(/&/g, "&amp;")
+                .replace(/</g, "&lt;")
+                .replace(/>/g, "&gt;")
+                .replace(/"/g, "&quot;")
+                .replace(/'/g, "&#x27;")
+                .replace(/\//g, "&#x2F;");
+  },
+
+  getString: function(aName) {
+    if (!this.bundle) {
+        this.bundle = Services.strings.createBundle("chrome://browser/locale/pippki.properties");
+    }
+    return this.bundle.GetStringFromName(aName);
+  },
+
+  formatString: function(aName, argList) {
+    if (!this.bundle) {
+      this.bundle =
+        Services.strings.createBundle("chrome://browser/locale/pippki.properties");
+    }
+    let escapedArgList = Array.from(argList, x => this.escapeHTML(x));
+    return this.bundle.formatStringFromName(aName, escapedArgList,
+                                            escapedArgList.length);
+  },
+
+  getPrompt: function(aTitle, aText, aButtons) {
+    return new Prompt({
+      title: aTitle,
+      text: aText,
+      buttons: aButtons,
+    });
+  },
+
+  showPrompt: function(aPrompt) {
+    let response = null;
+    aPrompt.show(function(data) {
+      response = data;
+    });
+
+    // Spin this thread while we wait for a result
+    let thread = Services.tm.currentThread;
+    while (response === null)
+      thread.processNextEvent(true);
+
+    return response;
+  },
+
+  confirmDownloadCACert: function(aCtx, aCert, aTrust) {
+    while (true) {
+      let prompt = this.getPrompt(this.getString("downloadCert.title"),
+                                  this.getString("downloadCert.message1"),
+                                  [ this.getString("nssdialogs.ok.label"),
+                                    this.getString("downloadCert.viewCert.label"),
+                                    this.getString("nssdialogs.cancel.label")
+                                  ]);
+
+      prompt.addCheckbox({ id: "trustSSL", label: this.getString("downloadCert.trustSSL"), checked: false })
+            .addCheckbox({ id: "trustEmail", label: this.getString("downloadCert.trustEmail"), checked: false })
+            .addCheckbox({ id: "trustSign", label: this.getString("downloadCert.trustObjSign"), checked: false });
+      let response = this.showPrompt(prompt);
+
+      // they hit the "view cert" button, so show the cert and try again
+      if (response.button == 1) {
+        this.viewCert(aCtx, aCert);
+        continue;
+      } else if (response.button != 0) {
+        return false;
+      }
+
+      aTrust.value = Ci.nsIX509CertDB.UNTRUSTED;
+      if (response.trustSSL) aTrust.value |= Ci.nsIX509CertDB.TRUSTED_SSL;
+      if (response.trustEmail) aTrust.value |= Ci.nsIX509CertDB.TRUSTED_EMAIL;
+      if (response.trustSign) aTrust.value |= Ci.nsIX509CertDB.TRUSTED_OBJSIGN;
+      return true;
+    }
+  },
+
+  setPKCS12FilePassword: function(aCtx, aPassword) {
+    // this dialog is never shown in Fennec; in Desktop it is shown while backing up a personal
+    // certificate to a file via Preferences->Advanced->Encryption->View Certificates->Your Certificates
+    throw "Unimplemented";
+  },
+
+  getPKCS12FilePassword: function(aCtx, aPassword) {
+    let prompt = this.getPrompt(this.getString("pkcs12.getpassword.title"),
+                                this.getString("pkcs12.getpassword.message"),
+                                [ this.getString("nssdialogs.ok.label"),
+                                  this.getString("nssdialogs.cancel.label")
+                                ]).addPassword({id: "pw"});
+    let response = this.showPrompt(prompt);
+    if (response.button != 0) {
+      return false;
+    }
+
+    aPassword.value = response.pw;
+    return true;
+  },
+
+  certInfoSection: function(aHeading, aDataPairs, aTrailingNewline = true) {
+    let certInfoStrings = [
+      "<big>" + this.getString(aHeading) + "</big>",
+    ];
+
+    for (let i = 0; i < aDataPairs.length; i += 2) {
+      let key = aDataPairs[i];
+      let value = aDataPairs[i + 1];
+      certInfoStrings.push(this.formatString(key, [value]));
+    }
+
+    if (aTrailingNewline) {
+      certInfoStrings.push("<br/>");
+    }
+
+    return certInfoStrings.join("<br/>");
+  },
+
+  viewCert: function(aCtx, aCert) {
+    let p = this.getPrompt(this.getString("certmgr.title"), "", [
+                             this.getString("nssdialogs.ok.label"),
+                           ]);
+    p.addLabel({ label: this.certInfoSection("certmgr.subjectinfo.label",
+                          ["certdetail.cn", aCert.commonName,
+                           "certdetail.o", aCert.organization,
+                           "certdetail.ou", aCert.organizationalUnit,
+                           "certdetail.serialnumber", aCert.serialNumber])})
+     .addLabel({ label: this.certInfoSection("certmgr.issuerinfo.label",
+                          ["certdetail.cn", aCert.issuerCommonName,
+                           "certdetail.o", aCert.issuerOrganization,
+                           "certdetail.ou", aCert.issuerOrganizationUnit])})
+     .addLabel({ label: this.certInfoSection("certmgr.periodofvalidity.label",
+                          ["certdetail.notBefore", aCert.validity.notBeforeLocalDay,
+                           "certdetail.notAfter", aCert.validity.notAfterLocalDay])})
+     .addLabel({ label: this.certInfoSection("certmgr.fingerprints.label",
+                          ["certdetail.sha256fingerprint", aCert.sha256Fingerprint,
+                           "certdetail.sha1fingerprint", aCert.sha1Fingerprint],
+                          false) });
+    this.showPrompt(p);
+  },
+
+  /**
+   * Returns a list of details of the given cert relevant for TLS client
+   * authentication.
+   *
+   * @param {nsIX509Cert} cert Cert to get the details of.
+   * @returns {String} <br/> delimited list of details.
+   */
+  getCertDetails: function(cert) {
+    let detailLines = [
+      this.formatString("clientAuthAsk.issuedTo", [cert.subjectName]),
+      this.formatString("clientAuthAsk.serial", [cert.serialNumber]),
+      this.formatString("clientAuthAsk.validityPeriod",
+                        [cert.validity.notBeforeLocalTime,
+                         cert.validity.notAfterLocalTime]),
+    ];
+    let keyUsages = cert.keyUsages;
+    if (keyUsages) {
+      detailLines.push(this.formatString("clientAuthAsk.keyUsages",
+                                         [keyUsages]));
+    }
+    let emailAddresses = cert.getEmailAddresses({});
+    if (emailAddresses.length > 0) {
+      let joinedAddresses = emailAddresses.join(", ");
+      detailLines.push(this.formatString("clientAuthAsk.emailAddresses",
+                                         [joinedAddresses]));
+    }
+    detailLines.push(this.formatString("clientAuthAsk.issuedBy",
+                                       [cert.issuerName]));
+    detailLines.push(this.formatString("clientAuthAsk.storedOn",
+                                       [cert.tokenName]));
+
+    return detailLines.join("<br/>");
+  },
+
+  viewCertDetails: function(details) {
+    let p = this.getPrompt(this.getString("clientAuthAsk.message3"),
+                    '',
+                    [ this.getString("nssdialogs.ok.label") ]);
+    p.addLabel({ label: details });
+    this.showPrompt(p);
+  },
+
+  chooseCertificate: function(ctx, hostname, port, organization, issuerOrg,
+                              certList, selectedIndex) {
+    let rememberSetting =
+      Services.prefs.getBoolPref("security.remember_cert_checkbox_default_setting");
+
+    let serverRequestedDetails = [
+      this.formatString("clientAuthAsk.hostnameAndPort",
+                        [hostname, port.toString()]),
+      this.formatString("clientAuthAsk.organization", [organization]),
+      this.formatString("clientAuthAsk.issuer", [issuerOrg]),
+    ].join("<br/>");
+
+    let certNickList = [];
+    let certDetailsList = [];
+    for (let i = 0; i < certList.length; i++) {
+      let cert = certList.queryElementAt(i, Ci.nsIX509Cert);
+      certNickList.push(this.formatString("clientAuthAsk.nickAndSerial",
+                                          [cert.nickname, cert.serialNumber]));
+      certDetailsList.push(this.getCertDetails(cert));
+    }
+
+    selectedIndex.value = 0;
+    while (true) {
+      let buttons = [
+        this.getString("nssdialogs.ok.label"),
+        this.getString("clientAuthAsk.viewCert.label"),
+        this.getString("nssdialogs.cancel.label"),
+      ];
+      let prompt = this.getPrompt(this.getString("clientAuthAsk.title"),
+                                  this.getString("clientAuthAsk.message1"),
+                                  buttons)
+      .addLabel({ id: "requestedDetails", label: serverRequestedDetails } )
+      .addMenulist({
+        id: "nicknames",
+        label: this.getString("clientAuthAsk.message2"),
+        values: certNickList,
+        selected: selectedIndex.value,
+      }).addCheckbox({
+        id: "rememberBox",
+        label: this.getString("clientAuthAsk.remember.label"),
+        checked: rememberSetting
+      });
+      let response = this.showPrompt(prompt);
+      selectedIndex.value = response.nicknames;
+      if (response.button == 1 /* buttons[1] */) {
+        this.viewCertDetails(certDetailsList[selectedIndex.value]);
+        continue;
+      } else if (response.button == 0 /* buttons[0] */) {
+        if (response.rememberBox == true) {
+          let caud = ctx.QueryInterface(Ci.nsIClientAuthUserDecision);
+          if (caud) {
+            caud.rememberClientAuthCertificate = true;
+          }
+        }
+        return true;
+      }
+      return false;
+    }
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([NSSDialogs]);
diff --git a/mobile/android/components/PersistentNotificationHandler.js b/mobile/android/components/PersistentNotificationHandler.js
new file mode 100644
index 0000000000..2a3529f5f6
--- /dev/null
+++ b/mobile/android/components/PersistentNotificationHandler.js
@@ -0,0 +1,78 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Messaging.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, 'Services', // jshint ignore:line
+                                  'resource://gre/modules/Services.jsm');
+XPCOMUtils.defineLazyServiceGetter(this, "notificationStorage",
+                                   "@mozilla.org/notificationStorage;1",
+                                   "nsINotificationStorage");
+XPCOMUtils.defineLazyServiceGetter(this, "serviceWorkerManager",
+                                   "@mozilla.org/serviceworkers/manager;1",
+                                   "nsIServiceWorkerManager");
+
+function PersistentNotificationHandler() {
+}
+
+PersistentNotificationHandler.prototype = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver]),
+  classID: Components.ID("{75390fe7-f8a3-423a-b3b1-258d7eabed40}"),
+
+  observe(subject, topic, data) {
+    if (Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_DEFAULT) {
+      Cu.import("resource://gre/modules/NotificationDB.jsm");
+    }
+    const persistentInfo = JSON.parse(data);
+
+    if (topic === 'persistent-notification-click') {
+      notificationStorage.getByID(persistentInfo.origin, persistentInfo.id, {
+        handle(id, title, dir, lang, body, tag, icon, data, behavior, serviceWorkerRegistrationScope) {
+          serviceWorkerManager.sendNotificationClickEvent(
+            persistentInfo.originSuffix,
+            serviceWorkerRegistrationScope,
+            id,
+            title,
+            dir,
+            lang,
+            body,
+            tag,
+            icon,
+            data,
+            behavior
+          );
+          notificationStorage.delete(persistentInfo.origin, persistentInfo.id);
+        }
+      });
+    } else if (topic === 'persistent-notification-close') {
+      notificationStorage.getByID(persistentInfo.origin, persistentInfo.id, {
+        handle(id, title, dir, lang, body, tag, icon, data, behavior, serviceWorkerRegistrationScope) {
+          serviceWorkerManager.sendNotificationCloseEvent(
+            persistentInfo.originSuffix,
+            serviceWorkerRegistrationScope,
+            id,
+            title,
+            dir,
+            lang,
+            body,
+            tag,
+            icon,
+            data,
+            behavior
+          );
+          notificationStorage.delete(persistentInfo.origin, persistentInfo.id);
+        }
+      });
+    }
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([
+  PersistentNotificationHandler
+]);
diff --git a/mobile/android/components/PresentationDevicePrompt.js b/mobile/android/components/PresentationDevicePrompt.js
new file mode 100644
index 0000000000..e3e0633736
--- /dev/null
+++ b/mobile/android/components/PresentationDevicePrompt.js
@@ -0,0 +1,134 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
+
+Cu.import('resource://gre/modules/XPCOMUtils.jsm');
+Cu.import('resource://gre/modules/Services.jsm');
+
+XPCOMUtils.defineLazyModuleGetter(this, "Prompt",
+                                  "resource://gre/modules/Prompt.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "UITelemetry",
+                                  "resource://gre/modules/UITelemetry.jsm");
+
+const kPRESENTATIONDEVICEPROMPT_CONTRACTID = "@mozilla.org/presentation-device/prompt;1";
+const kPRESENTATIONDEVICEPROMPT_CID        = Components.ID("{388bd149-c919-4a43-b646-d7ec57877689}");
+
+function debug(aMsg) {
+  // dump("-*- PresentationDevicePrompt: " + aMsg + "\n");
+}
+
+// nsIPresentationDevicePrompt
+function PresentationDevicePrompt() {
+  debug("PresentationDevicePrompt init");
+}
+
+PresentationDevicePrompt.prototype = {
+  classID: kPRESENTATIONDEVICEPROMPT_CID,
+  contractID: kPRESENTATIONDEVICEPROMPT_CONTRACTID,
+  classDescription: "Fennec Presentation Device Prompt",
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIPresentationDevicePrompt]),
+
+  _devices: [],   // Store all available presentation devices
+  _request: null, // Store the request from presentation api
+
+  _getString: function(aName) {
+    debug("_getString");
+
+    if (!this.bundle) {
+      this.bundle = Services.strings.createBundle("chrome://browser/locale/devicePrompt.properties");
+    }
+    return this.bundle.GetStringFromName(aName);
+  },
+
+  _loadDevices: function(requestURLs) {
+    debug("_loadDevices");
+
+    let deviceManager = Cc["@mozilla.org/presentation-device/manager;1"]
+                          .getService(Ci.nsIPresentationDeviceManager);
+    let devices = deviceManager.getAvailableDevices(requestURLs).QueryInterface(Ci.nsIArray);
+
+    // Re-load the available devices
+    this._devices = [];
+    for (let i = 0; i < devices.length; i++) {
+      let device = devices.queryElementAt(i, Ci.nsIPresentationDevice);
+      this._devices.push(device);
+    }
+  },
+
+  _getPromptMenu: function(aDevices) {
+    debug("_getPromptMenu");
+
+    return aDevices.map(function(device) {
+      return { label: device.name };
+    });
+  },
+
+  _getPrompt: function(aTitle, aMenu) {
+    debug("_getPrompt");
+
+    let p = new Prompt({
+      title: aTitle,
+    });
+
+    p.setSingleChoiceItems(aMenu);
+
+    return p;
+  },
+
+  _showPrompt: function(aPrompt, aCallback) {
+    debug("_showPrompt");
+
+    aPrompt.show(function(data) {
+      let buttonIndex = data.button;
+      aCallback(buttonIndex);
+    });
+  },
+
+  _selectDevice: function(aIndex) {
+    debug("_selectDevice");
+
+    if (!this._request) {
+      return;
+    }
+
+    if (aIndex < 0) {                    // Cancel request if no selected device,
+      this._request.cancel(Cr.NS_ERROR_DOM_NOT_ALLOWED_ERR);
+      return;
+    } else if (!this._devices.length) {  // or there is no available devices
+      this._request.cancel(Cr.NS_ERROR_DOM_NOT_FOUND_ERR);
+      return;
+    }
+
+    this._request.select(this._devices[aIndex]);
+  },
+
+  // This will be fired when window.PresentationRequest(URL).start() is called
+  promptDeviceSelection: function(aRequest) {
+    debug("promptDeviceSelection");
+
+    // Load available presentation devices into this._devices
+    this._loadDevices(aRequest.requestURLs);
+
+    if (!this._devices.length) { // Cancel request if no available device
+      aRequest.cancel(Cr.NS_ERROR_DOM_NOT_FOUND_ERR);
+      return;
+    }
+
+    this._request = aRequest;
+
+    let prompt = this._getPrompt(this._getString("deviceMenu.title"),
+                                 this._getPromptMenu(this._devices));
+
+    this._showPrompt(prompt, this._selectDevice.bind(this));
+
+    UITelemetry.addEvent("show.1", "dialog", null, "prompt_device_selection");
+  },
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([PresentationDevicePrompt]);
diff --git a/mobile/android/components/PresentationRequestUIGlue.js b/mobile/android/components/PresentationRequestUIGlue.js
new file mode 100644
index 0000000000..af252c8759
--- /dev/null
+++ b/mobile/android/components/PresentationRequestUIGlue.js
@@ -0,0 +1,86 @@
+/* -*- Mode: tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict"
+
+const { interfaces: Ci, utils: Cu, classes: Cc  } = Components;
+
+const TOPIC_PRESENTATION_RECEIVER_LAUNCH = "presentation-receiver:launch";
+const TOPIC_PRESENTATION_RECEIVER_LAUNCH_RESPONSE = "presentation-receiver:launch:response";
+
+// globals XPCOMUtils
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+// globals Services
+Cu.import("resource://gre/modules/Services.jsm");
+
+function log(str) {
+  // dump("-*- PresentationRequestUIGlue.js -*-: " + str + "\n");
+}
+
+function PresentationRequestUIGlue() { }
+
+PresentationRequestUIGlue.prototype = {
+  sendRequest: function sendRequest(aURL, aSessionId, aDevice) {
+    log("PresentationRequestUIGlue - sendRequest aURL=" + aURL +
+        " aSessionId=" + aSessionId);
+
+    let localDevice;
+    try {
+      localDevice = aDevice.QueryInterface(Ci.nsIPresentationLocalDevice);
+    } catch (e) {
+      /* XXX: Currently, Fennec only support 1-UA devices. Remove this
+       * Promise.reject() when it starts to support 2-UA devices.
+       */
+      log("Not an 1-UA device.")
+      return new Promise.reject();
+    }
+
+    return new Promise((aResolve, aReject) => {
+
+      let uuidGenerator = Cc["@mozilla.org/uuid-generator;1"]
+                            .getService(Ci.nsIUUIDGenerator);
+      let requestId = uuidGenerator.generateUUID().toString();
+
+      let handleObserve = (aSubject, aTopic, aData) => {
+        log("Got observe: aTopic=" + aTopic);
+
+        let data = JSON.parse(aData);
+        if (data.requestId != requestId) {
+          return;
+        }
+
+        Services.obs.removeObserver(handleObserve,
+                                    TOPIC_PRESENTATION_RECEIVER_LAUNCH_RESPONSE);
+        switch(data.result) {
+          case "success":
+            aResolve(aSubject);
+            break;
+          case "error":
+            aReject();
+            break;
+        };
+      };
+
+      Services.obs.addObserver(handleObserve,
+                               TOPIC_PRESENTATION_RECEIVER_LAUNCH_RESPONSE,
+                               false);
+
+      let data = {
+        url: aURL,
+        windowId: localDevice.windowId,
+        requestId: requestId
+      };
+      Services.obs.notifyObservers(null,
+                                   TOPIC_PRESENTATION_RECEIVER_LAUNCH,
+                                   JSON.stringify(data));
+    })
+  },
+
+  classID: Components.ID("9c550ef7-3ff6-4bd1-9ad1-5a3735b90d21"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIPresentationRequestUIGlue])
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([PresentationRequestUIGlue]);
diff --git a/mobile/android/components/PromptService.js b/mobile/android/components/PromptService.js
new file mode 100644
index 0000000000..93aff67eec
--- /dev/null
+++ b/mobile/android/components/PromptService.js
@@ -0,0 +1,878 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+const Ci = Components.interfaces;
+const Cc = Components.classes;
+const Cr = Components.results;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Prompt",
+                                  "resource://gre/modules/Prompt.jsm");
+
+var gPromptService = null;
+
+function PromptService() {
+  gPromptService = this;
+}
+
+PromptService.prototype = {
+  classID: Components.ID("{9a61149b-2276-4a0a-b79c-be994ad106cf}"),
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIPromptFactory, Ci.nsIPromptService, Ci.nsIPromptService2]),
+
+  /* ----------  nsIPromptFactory  ---------- */
+  // XXX Copied from nsPrompter.js.
+  getPrompt: function getPrompt(domWin, iid) {
+    // This is still kind of dumb; the C++ code delegated to login manager
+    // here, which in turn calls back into us via nsIPromptService2.
+    if (iid.equals(Ci.nsIAuthPrompt2) || iid.equals(Ci.nsIAuthPrompt)) {
+      try {
+        let pwmgr = Cc["@mozilla.org/passwordmanager/authpromptfactory;1"].getService(Ci.nsIPromptFactory);
+        return pwmgr.getPrompt(domWin, iid);
+      } catch (e) {
+        Cu.reportError("nsPrompter: Delegation to password manager failed: " + e);
+      }
+    }
+
+    let p = new InternalPrompt(domWin);
+    p.QueryInterface(iid);
+    return p;
+  },
+
+  /* ----------  private memebers  ---------- */
+
+  // nsIPromptService and nsIPromptService2 methods proxy to our Prompt class
+  callProxy: function(aMethod, aArguments) {
+    let prompt;
+    let domWin = aArguments[0];
+    prompt = new InternalPrompt(domWin);
+    return prompt[aMethod].apply(prompt, Array.prototype.slice.call(aArguments, 1));
+  },
+
+  /* ----------  nsIPromptService  ---------- */
+
+  alert: function() {
+    return this.callProxy("alert", arguments);
+  },
+  alertCheck: function() {
+    return this.callProxy("alertCheck", arguments);
+  },
+  confirm: function() {
+    return this.callProxy("confirm", arguments);
+  },
+  confirmCheck: function() {
+    return this.callProxy("confirmCheck", arguments);
+  },
+  confirmEx: function() {
+    return this.callProxy("confirmEx", arguments);
+  },
+  prompt: function() {
+    return this.callProxy("prompt", arguments);
+  },
+  promptUsernameAndPassword: function() {
+    return this.callProxy("promptUsernameAndPassword", arguments);
+  },
+  promptPassword: function() {
+    return this.callProxy("promptPassword", arguments);
+  },
+  select: function() {
+    return this.callProxy("select", arguments);
+  },
+
+  /* ----------  nsIPromptService2  ---------- */
+  promptAuth: function() {
+    return this.callProxy("promptAuth", arguments);
+  },
+  asyncPromptAuth: function() {
+    return this.callProxy("asyncPromptAuth", arguments);
+  }
+};
+
+function InternalPrompt(aDomWin) {
+  this._domWin = aDomWin;
+}
+
+InternalPrompt.prototype = {
+  _domWin: null,
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIPrompt, Ci.nsIAuthPrompt, Ci.nsIAuthPrompt2]),
+
+  /* ---------- internal methods ---------- */
+  _getPrompt: function _getPrompt(aTitle, aText, aButtons, aCheckMsg, aCheckState) {
+    let p = new Prompt({
+      window: this._domWin,
+      title: aTitle,
+      message: aText,
+      buttons: aButtons || [
+        PromptUtils.getLocaleString("OK"),
+        PromptUtils.getLocaleString("Cancel")
+      ]
+    });
+    return p;
+  },
+
+  addCheckbox: function addCheckbox(aPrompt, aCheckMsg, aCheckState) {
+    // Don't bother to check for aCheckSate. For nsIPomptService interfaces, aCheckState is an
+    // out param and is required to be defined. If we've gotten here without it, something
+    // has probably gone wrong and we should fail
+    if (aCheckMsg) {
+      aPrompt.addCheckbox({
+        label: PromptUtils.cleanUpLabel(aCheckMsg),
+        checked: aCheckState.value
+      });
+    }
+
+    return aPrompt;
+  },
+
+  addTextbox: function(prompt, value, autofocus, hint) {
+    prompt.addTextbox({
+      value: (value !== null) ? value : "",
+      autofocus: autofocus,
+      hint: hint
+    });
+  },
+
+  addPassword: function(prompt, value, autofocus, hint) {
+    prompt.addPassword({
+      value: (value !== null) ? value : "",
+      autofocus: autofocus,
+      hint: hint
+    });
+  },
+
+  /* Shows a native prompt, and then spins the event loop for this thread while we wait
+   * for a response
+   */
+  showPrompt: function showPrompt(aPrompt) {
+    if (this._domWin) {
+      PromptUtils.fireDialogEvent(this._domWin, "DOMWillOpenModalDialog");
+      let winUtils = this._domWin.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+      winUtils.enterModalState();
+    }
+
+    let retval = null;
+    aPrompt.show(function(data) {
+      retval = data;
+    });
+
+    // Spin this thread while we wait for a result
+    let thread = Services.tm.currentThread;
+    while (retval == null)
+      thread.processNextEvent(true);
+
+    if (this._domWin) {
+      let winUtils = this._domWin.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+      winUtils.leaveModalState();
+      PromptUtils.fireDialogEvent(this._domWin, "DOMModalDialogClosed");
+    }
+
+    return retval;
+  },
+
+  /*
+   * ---------- interface disambiguation ----------
+   *
+   * XXX Copied from nsPrompter.js.
+   *
+   * nsIPrompt and nsIAuthPrompt share 3 method names with slightly
+   * different arguments. All but prompt() have the same number of
+   * arguments, so look at the arg types to figure out how we're being
+   * called. :-(
+   */
+  prompt: function prompt() {
+    if (gPromptService.inContentProcess)
+      return gPromptService.callProxy("prompt", [null].concat(Array.prototype.slice.call(arguments)));
+
+    // also, the nsIPrompt flavor has 5 args instead of 6.
+    if (typeof arguments[2] == "object")
+      return this.nsIPrompt_prompt.apply(this, arguments);
+    else
+      return this.nsIAuthPrompt_prompt.apply(this, arguments);
+  },
+
+  promptUsernameAndPassword: function promptUsernameAndPassword() {
+    // Both have 6 args, so use types.
+    if (typeof arguments[2] == "object")
+      return this.nsIPrompt_promptUsernameAndPassword.apply(this, arguments);
+    else
+      return this.nsIAuthPrompt_promptUsernameAndPassword.apply(this, arguments);
+  },
+
+  promptPassword: function promptPassword() {
+    // Both have 5 args, so use types.
+    if (typeof arguments[2] == "object")
+      return this.nsIPrompt_promptPassword.apply(this, arguments);
+    else
+      return this.nsIAuthPrompt_promptPassword.apply(this, arguments);
+  },
+
+  /* ----------  nsIPrompt  ---------- */
+
+  alert: function alert(aTitle, aText) {
+    let p = this._getPrompt(aTitle, aText, [ PromptUtils.getLocaleString("OK") ]);
+    p.setHint("alert");
+    this.showPrompt(p);
+  },
+
+  alertCheck: function alertCheck(aTitle, aText, aCheckMsg, aCheckState) {
+    let p = this._getPrompt(aTitle, aText, [ PromptUtils.getLocaleString("OK") ]);
+    this.addCheckbox(p, aCheckMsg, aCheckState);
+    let data = this.showPrompt(p);
+    if (aCheckState && data.button > -1)
+      aCheckState.value = data.checkbox0;
+  },
+
+  confirm: function confirm(aTitle, aText) {
+    let p = this._getPrompt(aTitle, aText);
+    p.setHint("confirm");
+    let data = this.showPrompt(p);
+    return (data.button == 0);
+  },
+
+  confirmCheck: function confirmCheck(aTitle, aText, aCheckMsg, aCheckState) {
+    let p = this._getPrompt(aTitle, aText, null);
+    this.addCheckbox(p, aCheckMsg, aCheckState);
+    let data = this.showPrompt(p);
+    let ok = data.button == 0;
+    if (aCheckState && data.button > -1)
+      aCheckState.value = data.checkbox0;
+    return ok;
+  },
+
+  confirmEx: function confirmEx(aTitle, aText, aButtonFlags, aButton0,
+                      aButton1, aButton2, aCheckMsg, aCheckState) {
+    let buttons = [];
+    let titles = [aButton0, aButton1, aButton2];
+    for (let i = 0; i < 3; i++) {
+      let bTitle = null;
+      switch (aButtonFlags & 0xff) {
+        case Ci.nsIPromptService.BUTTON_TITLE_OK :
+          bTitle = PromptUtils.getLocaleString("OK");
+          break;
+        case Ci.nsIPromptService.BUTTON_TITLE_CANCEL :
+          bTitle = PromptUtils.getLocaleString("Cancel");
+          break;
+        case Ci.nsIPromptService.BUTTON_TITLE_YES :
+          bTitle = PromptUtils.getLocaleString("Yes");
+          break;
+        case Ci.nsIPromptService.BUTTON_TITLE_NO :
+          bTitle = PromptUtils.getLocaleString("No");
+          break;
+        case Ci.nsIPromptService.BUTTON_TITLE_SAVE :
+          bTitle = PromptUtils.getLocaleString("Save");
+          break;
+        case Ci.nsIPromptService.BUTTON_TITLE_DONT_SAVE :
+          bTitle = PromptUtils.getLocaleString("DontSave");
+          break;
+        case Ci.nsIPromptService.BUTTON_TITLE_REVERT :
+          bTitle = PromptUtils.getLocaleString("Revert");
+          break;
+        case Ci.nsIPromptService.BUTTON_TITLE_IS_STRING :
+          bTitle = PromptUtils.cleanUpLabel(titles[i]);
+        break;
+      }
+
+      if (bTitle)
+        buttons.push(bTitle);
+
+      aButtonFlags >>= 8;
+    }
+
+    let p = this._getPrompt(aTitle, aText, buttons);
+    this.addCheckbox(p, aCheckMsg, aCheckState);
+    let data = this.showPrompt(p);
+    if (aCheckState && data.button > -1)
+      aCheckState.value = data.checkbox0;
+    return data.button;
+  },
+
+  nsIPrompt_prompt: function nsIPrompt_prompt(aTitle, aText, aValue, aCheckMsg, aCheckState) {
+    let p = this._getPrompt(aTitle, aText, null, aCheckMsg, aCheckState);
+    p.setHint("prompt");
+    this.addTextbox(p, aValue.value, true);
+    this.addCheckbox(p, aCheckMsg, aCheckState);
+    let data = this.showPrompt(p);
+
+    let ok = data.button == 0;
+    if (aCheckState && data.button > -1)
+      aCheckState.value = data.checkbox0;
+    if (ok)
+      aValue.value = data.textbox0;
+    return ok;
+  },
+
+  nsIPrompt_promptPassword: function nsIPrompt_promptPassword(
+      aTitle, aText, aPassword, aCheckMsg, aCheckState) {
+    let p = this._getPrompt(aTitle, aText, null);
+    this.addPassword(p, aPassword.value, true, PromptUtils.getLocaleString("password", "passwdmgr"));
+    this.addCheckbox(p, aCheckMsg, aCheckState);
+    let data = this.showPrompt(p);
+
+    let ok = data.button == 0;
+    if (aCheckState && data.button > -1)
+      aCheckState.value = data.checkbox0;
+    if (ok)
+      aPassword.value = data.password0;
+    return ok;
+  },
+
+  nsIPrompt_promptUsernameAndPassword: function nsIPrompt_promptUsernameAndPassword(
+      aTitle, aText, aUsername, aPassword, aCheckMsg, aCheckState) {
+    let p = this._getPrompt(aTitle, aText, null);
+    this.addTextbox(p, aUsername.value, true, PromptUtils.getLocaleString("username", "passwdmgr"));
+    this.addPassword(p, aPassword.value, false, PromptUtils.getLocaleString("password", "passwdmgr"));
+    this.addCheckbox(p, aCheckMsg, aCheckState);
+    let data = this.showPrompt(p);
+
+    let ok = data.button == 0;
+    if (aCheckState && data.button > -1)
+      aCheckState.value = data.checkbox0;
+
+    if (ok) {
+      aUsername.value = data.textbox0;
+      aPassword.value = data.password0;
+    }
+    return ok;
+  },
+
+  select: function select(aTitle, aText, aCount, aSelectList, aOutSelection) {
+    let p = this._getPrompt(aTitle, aText, [ PromptUtils.getLocaleString("OK") ]);
+    p.addMenulist({ values: aSelectList });
+    let data = this.showPrompt(p);
+
+    let ok = data.button == 0;
+    if (ok)
+      aOutSelection.value = data.menulist0;
+
+    return ok;
+  },
+
+  /* ----------  nsIAuthPrompt  ---------- */
+
+  nsIAuthPrompt_prompt : function (title, text, passwordRealm, savePassword, defaultText, result) {
+    // TODO: Port functions from nsLoginManagerPrompter.js to here
+    if (defaultText)
+      result.value = defaultText;
+    return this.nsIPrompt_prompt(title, text, result, null, {});
+  },
+
+  nsIAuthPrompt_promptUsernameAndPassword : function(aTitle, aText, aPasswordRealm, aSavePassword, aUser, aPass) {
+    return this.nsIAuthPrompt_loginPrompt(aTitle, aText, aPasswordRealm, aSavePassword, aUser, aPass);
+  },
+
+  nsIAuthPrompt_promptPassword : function(aTitle, aText, aPasswordRealm, aSavePassword, aPass) {
+    return this.nsIAuthPrompt_loginPrompt(aTitle, aText, aPasswordRealm, aSavePassword, null, aPass);
+  },
+
+  nsIAuthPrompt_loginPrompt: function(aTitle, aPasswordRealm, aSavePassword, aUser, aPass) {
+    let checkMsg = null;
+    let check = { value: false };
+    let hostname, realm;
+    [hostname, realm, aUser] = PromptUtils.getHostnameAndRealm(aPasswordRealm);
+
+    let canSave = PromptUtils.canSaveLogin(hostname, aSavePassword);
+    if (canSave) {
+      // Look for existing logins.
+      let foundLogins = PromptUtils.pwmgr.findLogins({}, hostname, null, realm);
+      [checkMsg, check] = PromptUtils.getUsernameAndPassword(foundLogins, aUser, aPass);
+    }
+
+    // (eslint-disable: see bug 1177904)
+    let ok = false;
+    if (aUser)
+      ok = this.nsIPrompt_promptUsernameAndPassword(aTitle, aText, aUser, aPass, checkMsg, check); // eslint-disable-line no-undef
+    else
+      ok = this.nsIPrompt_promptPassword(aTitle, aText, aPass, checkMsg, check); // eslint-disable-line no-undef
+
+    if (ok && canSave && check.value)
+      PromptUtils.savePassword(hostname, realm, aUser, aPass);
+
+    return ok;
+  },
+
+  /* ----------  nsIAuthPrompt2  ---------- */
+
+  promptAuth: function promptAuth(aChannel, aLevel, aAuthInfo) {
+    let checkMsg = null;
+    let check = { value: false };
+    let message = PromptUtils.makeDialogText(aChannel, aAuthInfo);
+    let [username, password] = PromptUtils.getAuthInfo(aAuthInfo);
+    let [hostname, httpRealm] = PromptUtils.getAuthTarget(aChannel, aAuthInfo);
+    let foundLogins = PromptUtils.pwmgr.findLogins({}, hostname, null, httpRealm);
+
+    let canSave = PromptUtils.canSaveLogin(hostname, null);
+    if (canSave)
+      [checkMsg, check] = PromptUtils.getUsernameAndPassword(foundLogins, username, password);
+
+    if (username.value && password.value) {
+      PromptUtils.setAuthInfo(aAuthInfo, username.value, password.value);
+    }
+
+    let canAutologin = false;
+    if (aAuthInfo.flags & Ci.nsIAuthInformation.AUTH_PROXY &&
+        !(aAuthInfo.flags & Ci.nsIAuthInformation.PREVIOUS_FAILED) &&
+        Services.prefs.getBoolPref("signon.autologin.proxy"))
+      canAutologin = true;
+
+    let ok = canAutologin;
+    if (!ok && aAuthInfo.flags & Ci.nsIAuthInformation.ONLY_PASSWORD)
+      ok = this.nsIPrompt_promptPassword(null, message, password, checkMsg, check);
+    else if (!ok)
+      ok = this.nsIPrompt_promptUsernameAndPassword(null, message, username, password, checkMsg, check);
+
+    PromptUtils.setAuthInfo(aAuthInfo, username.value, password.value);
+
+    if (ok && canSave && check.value)
+      PromptUtils.savePassword(foundLogins, username, password, hostname, httpRealm);
+
+    return ok;
+  },
+
+  _asyncPrompts: {},
+  _asyncPromptInProgress: false,
+
+  _doAsyncPrompt : function() {
+    if (this._asyncPromptInProgress)
+      return;
+
+    // Find the first prompt key we have in the queue
+    let hashKey = null;
+    for (hashKey in this._asyncPrompts)
+      break;
+
+    if (!hashKey)
+      return;
+
+    // If login manger has logins for this host, defer prompting if we're
+    // already waiting on a master password entry.
+    let prompt = this._asyncPrompts[hashKey];
+    let prompter = prompt.prompter;
+    let [hostname, httpRealm] = PromptUtils.getAuthTarget(prompt.channel, prompt.authInfo);
+    let foundLogins = PromptUtils.pwmgr.findLogins({}, hostname, null, httpRealm);
+    if (foundLogins.length > 0 && PromptUtils.pwmgr.uiBusy)
+      return;
+
+    this._asyncPromptInProgress = true;
+    prompt.inProgress = true;
+
+    let self = this;
+
+    let runnable = {
+      run: function() {
+        let ok = false;
+        try {
+          ok = prompter.promptAuth(prompt.channel, prompt.level, prompt.authInfo);
+        } catch (e) {
+          Cu.reportError("_doAsyncPrompt:run: " + e + "\n");
+        }
+
+        delete self._asyncPrompts[hashKey];
+        prompt.inProgress = false;
+        self._asyncPromptInProgress = false;
+
+        for (let consumer of prompt.consumers) {
+          if (!consumer.callback)
+            // Not having a callback means that consumer didn't provide it
+            // or canceled the notification
+            continue;
+
+          try {
+            if (ok)
+              consumer.callback.onAuthAvailable(consumer.context, prompt.authInfo);
+            else
+              consumer.callback.onAuthCancelled(consumer.context, true);
+          } catch (e) { /* Throw away exceptions caused by callback */ }
+        }
+        self._doAsyncPrompt();
+      }
+    }
+
+    Services.tm.mainThread.dispatch(runnable, Ci.nsIThread.DISPATCH_NORMAL);
+  },
+
+  asyncPromptAuth: function asyncPromptAuth(aChannel, aCallback, aContext, aLevel, aAuthInfo) {
+    let cancelable = null;
+    try {
+      // If the user submits a login but it fails, we need to remove the
+      // notification bar that was displayed. Conveniently, the user will
+      // be prompted for authentication again, which brings us here.
+      //this._removeLoginNotifications();
+
+      cancelable = {
+        QueryInterface: XPCOMUtils.generateQI([Ci.nsICancelable]),
+        callback: aCallback,
+        context: aContext,
+        cancel: function() {
+          this.callback.onAuthCancelled(this.context, false);
+          this.callback = null;
+          this.context = null;
+        }
+      };
+      let [hostname, httpRealm] = PromptUtils.getAuthTarget(aChannel, aAuthInfo);
+      let hashKey = aLevel + "|" + hostname + "|" + httpRealm;
+      let asyncPrompt = this._asyncPrompts[hashKey];
+      if (asyncPrompt) {
+        asyncPrompt.consumers.push(cancelable);
+        return cancelable;
+      }
+
+      asyncPrompt = {
+        consumers: [cancelable],
+        channel: aChannel,
+        authInfo: aAuthInfo,
+        level: aLevel,
+        inProgress : false,
+        prompter: this
+      }
+
+      this._asyncPrompts[hashKey] = asyncPrompt;
+      this._doAsyncPrompt();
+    } catch (e) {
+      Cu.reportError("PromptService: " + e + "\n");
+      throw e;
+    }
+    return cancelable;
+  }
+};
+
+var PromptUtils = {
+  getLocaleString: function pu_getLocaleString(aKey, aService) {
+    if (aService == "passwdmgr")
+      return this.cleanUpLabel(this.passwdBundle.GetStringFromName(aKey));
+
+    return this.cleanUpLabel(this.bundle.GetStringFromName(aKey));
+  },
+
+  //
+  // Copied from chrome://global/content/commonDialog.js
+  //
+  cleanUpLabel: function cleanUpLabel(aLabel) {
+    // This is for labels which may contain embedded access keys.
+    // If we end in (&X) where X represents the access key, optionally preceded
+    // by spaces and/or followed by the ':' character,
+    // remove the access key placeholder + leading spaces from the label.
+    // Otherwise a character preceded by one but not two &s is the access key.
+
+    // Note that if you change the following code, see the comment of
+    // nsTextBoxFrame::UpdateAccessTitle.
+    if (!aLabel)
+      return "";
+
+    if (/ *\(\&([^&])\)(:?)$/.test(aLabel)) {
+      aLabel = RegExp.leftContext + RegExp.$2;
+    } else if (/^([^&]*)\&(([^&]).*$)/.test(aLabel)) {
+      aLabel = RegExp.$1 + RegExp.$2;
+    }
+
+    // Special code for using that & symbol
+    aLabel = aLabel.replace(/\&\&/g, "&");
+
+    return aLabel;
+  },
+
+  get pwmgr() {
+    delete this.pwmgr;
+    return this.pwmgr = Cc["@mozilla.org/login-manager;1"].getService(Ci.nsILoginManager);
+  },
+
+  getHostnameAndRealm: function pu_getHostnameAndRealm(aRealmString) {
+    let httpRealm = /^.+ \(.+\)$/;
+    if (httpRealm.test(aRealmString))
+      return [null, null, null];
+
+    let uri = Services.io.newURI(aRealmString, null, null);
+    let pathname = "";
+
+    if (uri.path != "/")
+      pathname = uri.path;
+
+    let formattedHostname = this._getFormattedHostname(uri);
+    return [formattedHostname, formattedHostname + pathname, uri.username];
+  },
+
+  canSaveLogin: function pu_canSaveLogin(aHostname, aSavePassword) {
+    let canSave = !this._inPrivateBrowsing && this.pwmgr.getLoginSavingEnabled(aHostname)
+    if (aSavePassword)
+      canSave = canSave && (aSavePassword == Ci.nsIAuthPrompt.SAVE_PASSWORD_PERMANENTLY)
+    return canSave;
+  },
+
+  getUsernameAndPassword: function pu_getUsernameAndPassword(aFoundLogins, aUser, aPass) {
+    let checkLabel = null;
+    let check = { value: false };
+    let selectedLogin;
+
+    checkLabel = this.getLocaleString("rememberButton", "passwdmgr");
+
+    // XXX Like the original code, we can't deal with multiple
+    // account selection. (bug 227632)
+    if (aFoundLogins.length > 0) {
+      selectedLogin = aFoundLogins[0];
+
+      // If the caller provided a username, try to use it. If they
+      // provided only a password, this will try to find a password-only
+      // login (or return null if none exists).
+      if (aUser.value)
+        selectedLogin = this.findLogin(aFoundLogins, "username", aUser.value);
+
+      if (selectedLogin) {
+        check.value = true;
+        aUser.value = selectedLogin.username;
+        // If the caller provided a password, prefer it.
+        if (!aPass.value)
+          aPass.value = selectedLogin.password;
+      }
+    }
+
+    return [checkLabel, check];
+  },
+
+  findLogin: function pu_findLogin(aLogins, aName, aValue) {
+    for (let i = 0; i < aLogins.length; i++)
+      if (aLogins[i][aName] == aValue)
+        return aLogins[i];
+    return null;
+  },
+
+  savePassword: function pu_savePassword(aLogins, aUser, aPass, aHostname, aRealm) {
+    let selectedLogin = this.findLogin(aLogins, "username", aUser.value);
+
+    // If we didn't find an existing login, or if the username
+    // changed, save as a new login.
+    if (!selectedLogin) {
+      // add as new
+      var newLogin = Cc["@mozilla.org/login-manager/loginInfo;1"].createInstance(Ci.nsILoginInfo);
+      newLogin.init(aHostname, null, aRealm, aUser.value, aPass.value, "", "");
+      this.pwmgr.addLogin(newLogin);
+    } else if (aPass.value != selectedLogin.password) {
+      // update password
+      this.updateLogin(selectedLogin, aPass.value);
+    } else {
+      this.updateLogin(selectedLogin);
+    }
+  },
+
+  updateLogin: function pu_updateLogin(aLogin, aPassword) {
+    let now = Date.now();
+    let propBag = Cc["@mozilla.org/hash-property-bag;1"].createInstance(Ci.nsIWritablePropertyBag);
+    if (aPassword) {
+      propBag.setProperty("password", aPassword);
+      // Explicitly set the password change time here (even though it would
+      // be changed automatically), to ensure that it's exactly the same
+      // value as timeLastUsed.
+      propBag.setProperty("timePasswordChanged", now);
+    }
+    propBag.setProperty("timeLastUsed", now);
+    propBag.setProperty("timesUsedIncrement", 1);
+
+    this.pwmgr.modifyLogin(aLogin, propBag);
+  },
+
+  // JS port of http://mxr.mozilla.org/mozilla-central/source/embedding/components/windowwatcher/nsPrompt.cpp#388
+  makeDialogText: function pu_makeDialogText(aChannel, aAuthInfo) {
+    let isProxy    = (aAuthInfo.flags & Ci.nsIAuthInformation.AUTH_PROXY);
+    let isPassOnly = (aAuthInfo.flags & Ci.nsIAuthInformation.ONLY_PASSWORD);
+    let isCrossOrig = (aAuthInfo.flags &
+                       Ci.nsIAuthInformation.CROSS_ORIGIN_SUB_RESOURCE);
+
+    let username = aAuthInfo.username;
+    let [displayHost, realm] = this.getAuthTarget(aChannel, aAuthInfo);
+
+    // Suppress "the site says: $realm" when we synthesized a missing realm.
+    if (!aAuthInfo.realm && !isProxy)
+    realm = "";
+
+    // Trim obnoxiously long realms.
+    if (realm.length > 150) {
+      realm = realm.substring(0, 150);
+      // Append "..." (or localized equivalent).
+      realm += this.ellipsis;
+    }
+
+    let text;
+    if (isProxy) {
+      text = this.bundle.formatStringFromName("EnterLoginForProxy3", [realm, displayHost], 2);
+    } else if (isPassOnly) {
+      text = this.bundle.formatStringFromName("EnterPasswordFor", [username, displayHost], 2);
+    } else if (isCrossOrig) {
+      text = this.bundle.formatStringFromName("EnterUserPasswordForCrossOrigin2", [displayHost], 1);
+    } else if (!realm) {
+      text = this.bundle.formatStringFromName("EnterUserPasswordFor2", [displayHost], 1);
+    } else {
+      text = this.bundle.formatStringFromName("EnterLoginForRealm3", [realm, displayHost], 2);
+    }
+
+    return text;
+  },
+
+  // JS port of http://mxr.mozilla.org/mozilla-central/source/embedding/components/windowwatcher/nsPromptUtils.h#89
+  getAuthHostPort: function pu_getAuthHostPort(aChannel, aAuthInfo) {
+    let uri = aChannel.URI;
+    let res = { host: null, port: -1 };
+    if (aAuthInfo.flags & aAuthInfo.AUTH_PROXY) {
+      let proxy = aChannel.QueryInterface(Ci.nsIProxiedChannel);
+      res.host = proxy.proxyInfo.host;
+      res.port = proxy.proxyInfo.port;
+    } else {
+      res.host = uri.host;
+      res.port = uri.port;
+    }
+    return res;
+  },
+
+  getAuthTarget : function pu_getAuthTarget(aChannel, aAuthInfo) {
+    let hostname, realm;
+    // If our proxy is demanding authentication, don't use the
+    // channel's actual destination.
+    if (aAuthInfo.flags & Ci.nsIAuthInformation.AUTH_PROXY) {
+        if (!(aChannel instanceof Ci.nsIProxiedChannel))
+          throw "proxy auth needs nsIProxiedChannel";
+
+      let info = aChannel.proxyInfo;
+      if (!info)
+        throw "proxy auth needs nsIProxyInfo";
+
+      // Proxies don't have a scheme, but we'll use "moz-proxy://"
+      // so that it's more obvious what the login is for.
+      let idnService = Cc["@mozilla.org/network/idn-service;1"].getService(Ci.nsIIDNService);
+      hostname = "moz-proxy://" + idnService.convertUTF8toACE(info.host) + ":" + info.port;
+      realm = aAuthInfo.realm;
+      if (!realm)
+        realm = hostname;
+
+      return [hostname, realm];
+    }
+    hostname = this.getFormattedHostname(aChannel.URI);
+
+    // If a HTTP WWW-Authenticate header specified a realm, that value
+    // will be available here. If it wasn't set or wasn't HTTP, we'll use
+    // the formatted hostname instead.
+    realm = aAuthInfo.realm;
+    if (!realm)
+      realm = hostname;
+
+    return [hostname, realm];
+  },
+
+  getAuthInfo : function pu_getAuthInfo(aAuthInfo) {
+    let flags = aAuthInfo.flags;
+    let username = {value: ""};
+    let password = {value: ""};
+
+    if (flags & Ci.nsIAuthInformation.NEED_DOMAIN && aAuthInfo.domain)
+      username.value = aAuthInfo.domain + "\\" + aAuthInfo.username;
+    else
+      username.value = aAuthInfo.username;
+
+    password.value = aAuthInfo.password
+
+    return [username, password];
+  },
+
+  setAuthInfo : function (aAuthInfo, username, password) {
+    var flags = aAuthInfo.flags;
+    if (flags & Ci.nsIAuthInformation.NEED_DOMAIN) {
+      // Domain is separated from username by a backslash
+      var idx = username.indexOf("\\");
+      if (idx == -1) {
+        aAuthInfo.username = username;
+      } else {
+        aAuthInfo.domain   =  username.substring(0, idx);
+        aAuthInfo.username =  username.substring(idx+1);
+      }
+    } else {
+      aAuthInfo.username = username;
+    }
+    aAuthInfo.password = password;
+  },
+
+  /**
+   * Strip out things like userPass and path for display.
+   */
+  getFormattedHostname : function pu_getFormattedHostname(uri) {
+    return uri.scheme + "://" + uri.hostPort;
+  },
+
+  fireDialogEvent: function(aDomWin, aEventName) {
+    // accessing the document object can throw if this window no longer exists. See bug 789888.
+    try {
+      if (!aDomWin.document)
+        return;
+      let event = aDomWin.document.createEvent("Events");
+      event.initEvent(aEventName, true, true);
+      let winUtils = aDomWin.QueryInterface(Ci.nsIInterfaceRequestor)
+                           .getInterface(Ci.nsIDOMWindowUtils);
+      winUtils.dispatchEventToChromeOnly(aDomWin, event);
+    } catch(ex) {
+    }
+  }
+};
+
+XPCOMUtils.defineLazyGetter(PromptUtils, "passwdBundle", function () {
+  return Services.strings.createBundle("chrome://passwordmgr/locale/passwordmgr.properties");
+});
+
+XPCOMUtils.defineLazyGetter(PromptUtils, "bundle", function () {
+  return Services.strings.createBundle("chrome://global/locale/commonDialogs.properties");
+});
+
+
+// Factory for wrapping nsIAuthPrompt interfaces to make them usable via an nsIAuthPrompt2 interface.
+// XXX Copied from nsPrompter.js.
+function AuthPromptAdapterFactory() {
+}
+
+AuthPromptAdapterFactory.prototype = {
+  classID: Components.ID("{80dae1e9-e0d2-4974-915f-f97050fa8068}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIAuthPromptAdapterFactory]),
+
+  /* ----------  nsIAuthPromptAdapterFactory ---------- */
+
+  createAdapter: function(aPrompt) {
+    return new AuthPromptAdapter(aPrompt);
+  }
+};
+
+
+// Takes an nsIAuthPrompt implementation, wraps it with a nsIAuthPrompt2 shell.
+// XXX Copied from nsPrompter.js.
+function AuthPromptAdapter(aPrompt) {
+  this.prompt = aPrompt;
+}
+
+AuthPromptAdapter.prototype = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIAuthPrompt2]),
+  prompt: null,
+
+  /* ----------  nsIAuthPrompt2 ---------- */
+
+  promptAuth: function(aChannel, aLevel, aAuthInfo, aCheckLabel, aCheckValue) {
+    let message = PromptUtils.makeDialogText(aChannel, aAuthInfo);
+
+    let [username, password] = PromptUtils.getAuthInfo(aAuthInfo);
+    let [host, realm]  = PromptUtils.getAuthTarget(aChannel, aAuthInfo);
+    let authTarget = host + " (" + realm + ")";
+
+    let ok;
+    if (aAuthInfo.flags & Ci.nsIAuthInformation.ONLY_PASSWORD) {
+      ok = this.prompt.promptPassword(null, message, authTarget, Ci.nsIAuthPrompt.SAVE_PASSWORD_PERMANENTLY, password);
+    } else {
+      ok = this.prompt.promptUsernameAndPassword(null, message, authTarget, Ci.nsIAuthPrompt.SAVE_PASSWORD_PERMANENTLY, username, password);
+    }
+
+    if (ok) {
+      PromptUtils.setAuthInfo(aAuthInfo, username.value, password.value);
+    }
+    return ok;
+  },
+
+  asyncPromptAuth: function(aChannel, aCallback, aContext, aLevel, aAuthInfo, aCheckLabel, aCheckValue) {
+    throw Cr.NS_ERROR_NOT_IMPLEMENTED;
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([PromptService, AuthPromptAdapterFactory]);
diff --git a/mobile/android/components/SessionStore.idl b/mobile/android/components/SessionStore.idl
new file mode 100644
index 0000000000..14ddd5834f
--- /dev/null
+++ b/mobile/android/components/SessionStore.idl
@@ -0,0 +1,86 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIDOMWindow;
+interface nsIDOMNode;
+
+/**
+ * nsISessionStore keeps track of the current browsing state.
+ *
+ * The nsISessionStore API operates mostly on browser windows and the browser
+ * tabs contained in them.
+ */
+
+[scriptable, uuid(da9ffc70-d444-47d4-b4ab-df3fb0fd24d0)]
+interface nsISessionStore : nsISupports
+{
+  /**
+   * Get the current browsing state.
+   * @returns a JSON string representing the session state.
+   */
+  AString getBrowserState();
+
+  /**
+   * Get the number of restore-able tabs for a browser window
+   */
+  unsigned long getClosedTabCount(in nsIDOMWindow aWindow);
+
+  /**
+   * Get closed tab data
+   *
+   * @param aWindow is the browser window for which to get closed tab data
+   * @returns a JS array of closed tabs.
+   */
+  jsval getClosedTabs(in nsIDOMWindow aWindow);
+
+  /**
+   * @param aWindow is the browser window to reopen a closed tab in.
+   * @param aCloseTabData is the data of the tab to be restored.
+   * @returns a reference to the reopened tab.
+   */
+  nsIDOMNode undoCloseTab(in nsIDOMWindow aWindow, in jsval aCloseTabData);
+
+  /**
+   * @param aWindow is the browser window associated with the closed tab.
+   * @param aIndex  is the index of the closed tab to be removed (FIFO ordered).
+   */
+  nsIDOMNode forgetClosedTab(in nsIDOMWindow aWindow, in unsigned long aIndex);
+
+  /**
+   * @param aTab is the browser tab to get the value for.
+   * @param aKey is the value's name.
+   * 
+   * @returns A string value or an empty string if none is set.
+   */
+  AString getTabValue(in jsval aTab, in AString aKey);
+
+  /**
+   * @param aTab         is the browser tab to set the value for.
+   * @param aKey         is the value's name.
+   * @param aStringValue is the value itself (use JSON.stringify/parse before setting JS objects).
+   */
+  void setTabValue(in jsval aTab, in AString aKey, in AString aStringValue);
+
+  /**
+   * @param aTab is the browser tab to get the value for.
+   * @param aKey is the value's name.
+   */
+  void deleteTabValue(in jsval aTab, in AString aKey);
+
+  /**
+   * Restores the previous browser session using a fast, lightweight strategy
+   * @param aSessionString The session string to restore from. If null, the
+   *                       backup session file is read from.
+   */
+  void restoreLastSession(in AString aSessionString);
+
+  /**
+   * Removes a window from the current session history. Data from this window
+   * won't be saved when its closed.
+   * @param aWindow The window to remove
+   */
+  void removeWindow(in nsIDOMWindow aWindow);
+};
diff --git a/mobile/android/components/SessionStore.js b/mobile/android/components/SessionStore.js
new file mode 100644
index 0000000000..18ac6bf940
--- /dev/null
+++ b/mobile/android/components/SessionStore.js
@@ -0,0 +1,1794 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+const Cr = Components.results;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Task", "resource://gre/modules/Task.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "OS", "resource://gre/modules/osfile.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Messaging", "resource://gre/modules/Messaging.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "PrivateBrowsingUtils", "resource://gre/modules/PrivateBrowsingUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "FormData", "resource://gre/modules/FormData.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "ScrollPosition", "resource://gre/modules/ScrollPosition.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "TelemetryStopwatch", "resource://gre/modules/TelemetryStopwatch.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Log", "resource://gre/modules/AndroidLog.jsm", "AndroidLog");
+XPCOMUtils.defineLazyModuleGetter(this, "SharedPreferences", "resource://gre/modules/SharedPreferences.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Utils", "resource://gre/modules/sessionstore/Utils.jsm");
+XPCOMUtils.defineLazyServiceGetter(this, "serializationHelper",
+                                   "@mozilla.org/network/serialization-helper;1",
+                                   "nsISerializationHelper");
+
+function dump(a) {
+  Services.console.logStringMessage(a);
+}
+
+let loggingEnabled = false;
+
+function log(a) {
+  if (!loggingEnabled) {
+    return;
+  }
+  Log.d("SessionStore", a);
+}
+
+// -----------------------------------------------------------------------
+// Session Store
+// -----------------------------------------------------------------------
+
+const STATE_STOPPED = 0;
+const STATE_RUNNING = 1;
+const STATE_QUITTING = -1;
+const STATE_QUITTING_FLUSHED = -2;
+
+const PRIVACY_NONE = 0;
+const PRIVACY_ENCRYPTED = 1;
+const PRIVACY_FULL = 2;
+
+const PREFS_RESTORE_FROM_CRASH = "browser.sessionstore.resume_from_crash";
+const PREFS_MAX_CRASH_RESUMES = "browser.sessionstore.max_resumed_crashes";
+
+const MINIMUM_SAVE_DELAY = 2000;
+// We reduce the delay in background because we could be killed at any moment,
+// however we don't set it to 0 in order to allow for multiple events arriving
+// one after the other to be batched together in one write operation.
+const MINIMUM_SAVE_DELAY_BACKGROUND = 200;
+
+function SessionStore() { }
+
+SessionStore.prototype = {
+  classID: Components.ID("{8c1f07d6-cba3-4226-a315-8bd43d67d032}"),
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsISessionStore,
+                                         Ci.nsIDOMEventListener,
+                                         Ci.nsIObserver,
+                                         Ci.nsISupportsWeakReference]),
+
+  _windows: {},
+  _lastSaveTime: 0,
+  _lastBackupTime: 0,
+  _interval: 10000,
+  _backupInterval: 120000, // 2 minutes
+  _minSaveDelay: MINIMUM_SAVE_DELAY,
+  _maxTabsUndo: 5,
+  _pendingWrite: 0,
+  _scrollSavePending: null,
+  _writeInProgress: false,
+
+  // We only want to start doing backups if we've successfully
+  // written the session data at least once.
+  _sessionDataIsGood: false,
+
+  // The index where the most recently closed tab was in the tabs array
+  // when it was closed.
+  _lastClosedTabIndex: -1,
+
+  // Whether or not to send notifications for changes to the closed tabs.
+  _notifyClosedTabs: false,
+
+  // If we're simultaneously closing both a tab and Firefox, we don't want
+  // to bother reloading the newly selected tab if it is zombified.
+  // The Java UI will tell us which tab to watch out for.
+  _keepAsZombieTabId: -1,
+
+  init: function ss_init() {
+    loggingEnabled = Services.prefs.getBoolPref("browser.sessionstore.debug_logging");
+
+    // Get file references
+    this._sessionFile = Services.dirsvc.get("ProfD", Ci.nsILocalFile);
+    this._sessionFileBackup = this._sessionFile.clone();
+    this._sessionFilePrevious = this._sessionFile.clone();
+    this._sessionFileTemp = this._sessionFile.clone();
+    this._sessionFile.append("sessionstore.js"); // The main session store save file.
+    this._sessionFileBackup.append("sessionstore.bak"); // A backup copy to guard against interrupted writes.
+    this._sessionFilePrevious.append("sessionstore.old"); // The previous session's file, used for what used to be the "Tabs from last time".
+    this._sessionFileTemp.append(this._sessionFile.leafName + ".tmp"); // Temporary file for writing changes to disk.
+
+    this._loadState = STATE_STOPPED;
+    this._startupRestoreFinished = false;
+
+    this._interval = Services.prefs.getIntPref("browser.sessionstore.interval");
+    this._backupInterval = Services.prefs.getIntPref("browser.sessionstore.backupInterval");
+    this._maxTabsUndo = Services.prefs.getIntPref("browser.sessionstore.max_tabs_undo");
+
+    // Copy changes in Gecko settings to their Java counterparts,
+    // so the startup code can access them
+    Services.prefs.addObserver(PREFS_RESTORE_FROM_CRASH, function() {
+      SharedPreferences.forApp().setBoolPref(PREFS_RESTORE_FROM_CRASH,
+        Services.prefs.getBoolPref(PREFS_RESTORE_FROM_CRASH));
+    }, false);
+    Services.prefs.addObserver(PREFS_MAX_CRASH_RESUMES, function() {
+      SharedPreferences.forApp().setIntPref(PREFS_MAX_CRASH_RESUMES,
+        Services.prefs.getIntPref(PREFS_MAX_CRASH_RESUMES));
+    }, false);
+  },
+
+  _clearDisk: function ss_clearDisk() {
+    this._sessionDataIsGood = false;
+
+    if (this._loadState > STATE_QUITTING) {
+      OS.File.remove(this._sessionFile.path);
+      OS.File.remove(this._sessionFileBackup.path);
+      OS.File.remove(this._sessionFilePrevious.path);
+      OS.File.remove(this._sessionFileTemp.path);
+    } else { // We're shutting down and must delete synchronously
+      if (this._sessionFile.exists()) { this._sessionFile.remove(false); }
+      if (this._sessionFileBackup.exists()) { this._sessionFileBackup.remove(false); }
+      if (this._sessionFileBackup.exists()) { this._sessionFilePrevious.remove(false); }
+      if (this._sessionFileBackup.exists()) { this._sessionFileTemp.remove(false); }
+    }
+  },
+
+  observe: function ss_observe(aSubject, aTopic, aData) {
+    let self = this;
+    let observerService = Services.obs;
+    switch (aTopic) {
+      case "app-startup":
+        observerService.addObserver(this, "final-ui-startup", true);
+        observerService.addObserver(this, "domwindowopened", true);
+        observerService.addObserver(this, "domwindowclosed", true);
+        observerService.addObserver(this, "browser:purge-session-history", true);
+        observerService.addObserver(this, "quit-application-requested", true);
+        observerService.addObserver(this, "quit-application-proceeding", true);
+        observerService.addObserver(this, "quit-application", true);
+        observerService.addObserver(this, "Session:Restore", true);
+        observerService.addObserver(this, "Session:NotifyLocationChange", true);
+        observerService.addObserver(this, "Tab:KeepZombified", true);
+        observerService.addObserver(this, "application-background", true);
+        observerService.addObserver(this, "application-foreground", true);
+        observerService.addObserver(this, "ClosedTabs:StartNotifications", true);
+        observerService.addObserver(this, "ClosedTabs:StopNotifications", true);
+        observerService.addObserver(this, "last-pb-context-exited", true);
+        observerService.addObserver(this, "Session:RestoreRecentTabs", true);
+        observerService.addObserver(this, "Tabs:OpenMultiple", true);
+        break;
+      case "final-ui-startup":
+        observerService.removeObserver(this, "final-ui-startup");
+        this.init();
+        break;
+      case "domwindowopened": {
+        let window = aSubject;
+        window.addEventListener("load", function() {
+          self.onWindowOpen(window);
+          window.removeEventListener("load", arguments.callee, false);
+        }, false);
+        break;
+      }
+      case "domwindowclosed": // catch closed windows
+        this.onWindowClose(aSubject);
+        break;
+      case "quit-application-requested":
+        log("quit-application-requested");
+        // Get a current snapshot of all windows
+        if (this._pendingWrite) {
+          this._forEachBrowserWindow(function(aWindow) {
+            self._collectWindowData(aWindow);
+          });
+        }
+        break;
+      case "quit-application-proceeding":
+        log("quit-application-proceeding");
+        // Freeze the data at what we've got (ignoring closing windows)
+        this._loadState = STATE_QUITTING;
+        break;
+      case "quit-application":
+        log("quit-application");
+        observerService.removeObserver(this, "domwindowopened");
+        observerService.removeObserver(this, "domwindowclosed");
+        observerService.removeObserver(this, "quit-application-requested");
+        observerService.removeObserver(this, "quit-application-proceeding");
+        observerService.removeObserver(this, "quit-application");
+
+        // Flush all pending writes to disk now
+        this.flushPendingState();
+        this._loadState = STATE_QUITTING_FLUSHED;
+
+        break;
+      case "browser:purge-session-history": // catch sanitization
+        log("browser:purge-session-history");
+        this._clearDisk();
+
+        // Clear all data about closed tabs
+        for (let [ssid, win] of Object.entries(this._windows))
+          win.closedTabs = [];
+
+        this._lastClosedTabIndex = -1;
+
+        if (this._loadState == STATE_RUNNING) {
+          // Save the purged state immediately
+          this.saveState();
+        } else if (this._loadState <= STATE_QUITTING) {
+          this.saveStateDelayed();
+          if (this._loadState == STATE_QUITTING_FLUSHED) {
+            this.flushPendingState();
+          }
+        }
+
+        Services.obs.notifyObservers(null, "sessionstore-state-purge-complete", "");
+        if (this._notifyClosedTabs) {
+          this._sendClosedTabsToJava(Services.wm.getMostRecentWindow("navigator:browser"));
+        }
+        break;
+      case "timer-callback":
+        if (this._loadState == STATE_RUNNING) {
+          // Timer call back for delayed saving
+          this._saveTimer = null;
+          log("timer-callback, pendingWrite = " + this._pendingWrite);
+          if (this._pendingWrite) {
+            this.saveState();
+          }
+        }
+        break;
+      case "Session:Restore": {
+        Services.obs.removeObserver(this, "Session:Restore");
+        if (aData) {
+          // Be ready to handle any restore failures by making sure we have a valid tab opened
+          let window = Services.wm.getMostRecentWindow("navigator:browser");
+          let restoreCleanup = {
+            observe: function (aSubject, aTopic, aData) {
+              Services.obs.removeObserver(restoreCleanup, "sessionstore-windows-restored");
+
+              if (window.BrowserApp.tabs.length == 0) {
+                window.BrowserApp.addTab("about:home", {
+                  selected: true
+                });
+              }
+              // Normally, _restoreWindow() will have set this to true already,
+              // but we want to make sure it's set even in case of a restore failure.
+              this._startupRestoreFinished = true;
+              log("startupRestoreFinished = true (through notification)");
+            }.bind(this)
+          };
+          Services.obs.addObserver(restoreCleanup, "sessionstore-windows-restored", false);
+
+          // Do a restore, triggered by Java
+          let data = JSON.parse(aData);
+          this.restoreLastSession(data.sessionString);
+        } else {
+          // Not doing a restore; just send restore message
+          this._startupRestoreFinished = true;
+          log("startupRestoreFinished = true");
+          Services.obs.notifyObservers(null, "sessionstore-windows-restored", "");
+        }
+        break;
+      }
+      case "Session:NotifyLocationChange": {
+        let browser = aSubject;
+
+        if (browser.__SS_restoreReloadPending && this._startupRestoreFinished) {
+          delete browser.__SS_restoreReloadPending;
+          log("remove restoreReloadPending");
+        }
+
+        if (browser.__SS_restoreDataOnLocationChange) {
+          delete browser.__SS_restoreDataOnLocationChange;
+          this._restoreZoom(browser.__SS_data.scrolldata, browser);
+        }
+        break;
+      }
+      case "Tabs:OpenMultiple": {
+        let data = JSON.parse(aData);
+
+        this._openTabs(data);
+
+        if (data.shouldNotifyTabsOpenedToJava) {
+          Messaging.sendRequest({
+            type: "Tabs:TabsOpened"
+          });
+        }
+        break;
+      }
+      case "Tab:KeepZombified": {
+        if (aData >= 0) {
+          this._keepAsZombieTabId = aData;
+          log("Tab:KeepZombified " + aData);
+        }
+        break;
+      }
+      case "application-background":
+        // We receive this notification when Android's onPause callback is
+        // executed. After onPause, the application may be terminated at any
+        // point without notice; therefore, we must synchronously write out any
+        // pending save state to ensure that this data does not get lost.
+        log("application-background");
+        // Tab events dispatched immediately before the application was backgrounded
+        // might actually arrive after this point, therefore save them without delay.
+        if (this._loadState == STATE_RUNNING) {
+          this._interval = 0;
+          this._minSaveDelay = MINIMUM_SAVE_DELAY_BACKGROUND; // A small delay allows successive tab events to be batched together.
+          this.flushPendingState();
+        }
+        break;
+      case "application-foreground":
+        // Reset minimum interval between session store writes back to default.
+        log("application-foreground");
+        this._interval = Services.prefs.getIntPref("browser.sessionstore.interval");
+        this._minSaveDelay = MINIMUM_SAVE_DELAY;
+
+        // If we skipped restoring a zombified tab before backgrounding,
+        // we might have to do it now instead.
+        let window = Services.wm.getMostRecentWindow("navigator:browser");
+        if (window) { // Might not yet be ready during a cold startup.
+          let tab = window.BrowserApp.selectedTab;
+          if (tab.browser.__SS_restore) {
+            this._restoreZombieTab(tab.browser, tab.id);
+          }
+        }
+        break;
+      case "ClosedTabs:StartNotifications":
+        this._notifyClosedTabs = true;
+        log("ClosedTabs:StartNotifications");
+        this._sendClosedTabsToJava(Services.wm.getMostRecentWindow("navigator:browser"));
+        break;
+      case "ClosedTabs:StopNotifications":
+        this._notifyClosedTabs = false;
+        log("ClosedTabs:StopNotifications");
+        break;
+      case "last-pb-context-exited":
+        // Clear private closed tab data when we leave private browsing.
+        for (let window of Object.values(this._windows)) {
+          window.closedTabs = window.closedTabs.filter(tab => !tab.isPrivate);
+        }
+        this._lastClosedTabIndex = -1;
+        break;
+      case "Session:RestoreRecentTabs": {
+        let data = JSON.parse(aData);
+        this._restoreTabs(data);
+        break;
+      }
+    }
+  },
+
+  handleEvent: function ss_handleEvent(aEvent) {
+    let window = aEvent.currentTarget.ownerDocument.defaultView;
+    switch (aEvent.type) {
+      case "TabOpen": {
+        let browser = aEvent.target;
+        log("TabOpen for tab " + window.BrowserApp.getTabForBrowser(browser).id);
+        this.onTabAdd(window, browser);
+        break;
+      }
+      case "TabClose": {
+        let browser = aEvent.target;
+        log("TabClose for tab " + window.BrowserApp.getTabForBrowser(browser).id);
+        this.onTabClose(window, browser, aEvent.detail);
+        this.onTabRemove(window, browser);
+        break;
+      }
+      case "TabPreZombify": {
+        let browser = aEvent.target;
+        log("TabPreZombify for tab " + window.BrowserApp.getTabForBrowser(browser).id);
+        this.onTabRemove(window, browser, true);
+        break;
+      }
+      case "TabPostZombify": {
+        let browser = aEvent.target;
+        log("TabPostZombify for tab " + window.BrowserApp.getTabForBrowser(browser).id);
+        this.onTabAdd(window, browser, true);
+        break;
+      }
+      case "TabSelect": {
+        let browser = aEvent.target;
+        log("TabSelect for tab " + window.BrowserApp.getTabForBrowser(browser).id);
+        this.onTabSelect(window, browser);
+        break;
+      }
+      case "DOMTitleChanged": {
+        // Use DOMTitleChanged to detect page loads over alternatives.
+        // onLocationChange happens too early, so we don't have the page title
+        // yet; pageshow happens too late, so we could lose session data if the
+        // browser were killed.
+        let browser = aEvent.currentTarget;
+        log("DOMTitleChanged for tab " + window.BrowserApp.getTabForBrowser(browser).id);
+        this.onTabLoad(window, browser);
+        break;
+      }
+      case "load": {
+        let browser = aEvent.currentTarget;
+
+        // Skip subframe loads.
+        if (browser.contentDocument !== aEvent.originalTarget) {
+          return;
+        }
+
+        // Handle restoring the text data into the content and frames.
+        // We wait until the main content and all frames are loaded
+        // before trying to restore this data.
+        log("load for tab " + window.BrowserApp.getTabForBrowser(browser).id);
+        if (browser.__SS_restoreDataOnLoad) {
+          delete browser.__SS_restoreDataOnLoad;
+          this._restoreTextData(browser.__SS_data.formdata, browser);
+        }
+        break;
+      }
+      case "pageshow":
+      case "AboutReaderContentReady": {
+        let browser = aEvent.currentTarget;
+
+        // Skip subframe pageshows.
+        if (browser.contentDocument !== aEvent.originalTarget) {
+          return;
+        }
+
+        if (browser.currentURI.spec.startsWith("about:reader") &&
+            !browser.contentDocument.body.classList.contains("loaded")) {
+          // Don't restore the scroll position of an about:reader page at this point;
+          // wait for the custom event dispatched from AboutReader.jsm instead.
+          return;
+        }
+
+        // Restoring the scroll position needs to happen after the zoom level has been
+        // restored, which is done by the MobileViewportManager either on first paint
+        // or on load, whichever comes first.
+        // In the latter case, our load handler runs before the MVM's one, which is the
+        // wrong way around, so we have to use a later event instead.
+        log(aEvent.type + " for tab " + window.BrowserApp.getTabForBrowser(browser).id);
+        if (browser.__SS_restoreDataOnPageshow) {
+          delete browser.__SS_restoreDataOnPageshow;
+          this._restoreScrollPosition(browser.__SS_data.scrolldata, browser);
+        } else {
+          // We're not restoring, capture the initial scroll position on pageshow.
+          this.onTabScroll(window, browser);
+        }
+        break;
+      }
+      case "change":
+      case "input":
+      case "DOMAutoComplete": {
+        let browser = aEvent.currentTarget;
+        log("TabInput for tab " + window.BrowserApp.getTabForBrowser(browser).id);
+        this.onTabInput(window, browser);
+        break;
+      }
+      case "resize":
+      case "scroll": {
+        let browser = aEvent.currentTarget;
+        // Duplicated logging check to avoid calling getTabForBrowser on each scroll event.
+        if (loggingEnabled) {
+          log(aEvent.type + " for tab " + window.BrowserApp.getTabForBrowser(browser).id);
+        }
+        if (!this._scrollSavePending) {
+          this._scrollSavePending =
+            window.setTimeout(() => {
+              this._scrollSavePending = null;
+              this.onTabScroll(window, browser);
+            }, 500);
+        }
+        break;
+      }
+    }
+  },
+
+  onWindowOpen: function ss_onWindowOpen(aWindow) {
+    // Return if window has already been initialized
+    if (aWindow && aWindow.__SSID && this._windows[aWindow.__SSID]) {
+      return;
+    }
+
+    // Ignore non-browser windows and windows opened while shutting down
+    if (aWindow.document.documentElement.getAttribute("windowtype") != "navigator:browser" || this._loadState <= STATE_QUITTING) {
+      return;
+    }
+
+    // Assign it a unique identifier (timestamp) and create its data object
+    aWindow.__SSID = "window" + Date.now();
+    this._windows[aWindow.__SSID] = { tabs: [], selected: 0, closedTabs: [] };
+
+    // Perform additional initialization when the first window is loading
+    if (this._loadState == STATE_STOPPED) {
+      this._loadState = STATE_RUNNING;
+      this._lastSaveTime = Date.now();
+    }
+
+    // Add tab change listeners to all already existing tabs
+    let tabs = aWindow.BrowserApp.tabs;
+    for (let i = 0; i < tabs.length; i++)
+      this.onTabAdd(aWindow, tabs[i].browser, true);
+
+    // Notification of tab add/remove/selection/zombification
+    let browsers = aWindow.document.getElementById("browsers");
+    browsers.addEventListener("TabOpen", this, true);
+    browsers.addEventListener("TabClose", this, true);
+    browsers.addEventListener("TabSelect", this, true);
+    browsers.addEventListener("TabPreZombify", this, true);
+    browsers.addEventListener("TabPostZombify", this, true);
+  },
+
+  onWindowClose: function ss_onWindowClose(aWindow) {
+    // Ignore windows not tracked by SessionStore
+    if (!aWindow.__SSID || !this._windows[aWindow.__SSID]) {
+      return;
+    }
+
+    let browsers = aWindow.document.getElementById("browsers");
+    browsers.removeEventListener("TabOpen", this, true);
+    browsers.removeEventListener("TabClose", this, true);
+    browsers.removeEventListener("TabSelect", this, true);
+    browsers.removeEventListener("TabPreZombify", this, true);
+    browsers.removeEventListener("TabPostZombify", this, true);
+
+    if (this._loadState == STATE_RUNNING) {
+      // Update all window data for a last time
+      this._collectWindowData(aWindow);
+
+      // Clear this window from the list
+      delete this._windows[aWindow.__SSID];
+
+      // Save the state without this window to disk
+      this.saveStateDelayed();
+    }
+
+    let tabs = aWindow.BrowserApp.tabs;
+    for (let i = 0; i < tabs.length; i++)
+      this.onTabRemove(aWindow, tabs[i].browser, true);
+
+    delete aWindow.__SSID;
+  },
+
+  onTabAdd: function ss_onTabAdd(aWindow, aBrowser, aNoNotification) {
+    // Use DOMTitleChange to catch the initial load and restore history
+    aBrowser.addEventListener("DOMTitleChanged", this, true);
+
+    // Use load to restore text data
+    aBrowser.addEventListener("load", this, true);
+
+    // Gecko might set the initial zoom level after the JS "load" event,
+    // so we have to restore zoom and scroll position after that.
+    aBrowser.addEventListener("pageshow", this, true);
+    aBrowser.addEventListener("AboutReaderContentReady", this, true);
+
+    // Use a combination of events to watch for text data changes
+    aBrowser.addEventListener("change", this, true);
+    aBrowser.addEventListener("input", this, true);
+    aBrowser.addEventListener("DOMAutoComplete", this, true);
+
+    // Record the current scroll position and zoom level.
+    aBrowser.addEventListener("scroll", this, true);
+    aBrowser.addEventListener("resize", this, true);
+
+    log("onTabAdd() ran for tab " + aWindow.BrowserApp.getTabForBrowser(aBrowser).id +
+        ", aNoNotification = " + aNoNotification);
+    if (!aNoNotification) {
+      this.saveStateDelayed();
+    }
+    this._updateCrashReportURL(aWindow);
+  },
+
+  onTabRemove: function ss_onTabRemove(aWindow, aBrowser, aNoNotification) {
+    // Cleanup event listeners
+    aBrowser.removeEventListener("DOMTitleChanged", this, true);
+    aBrowser.removeEventListener("load", this, true);
+    aBrowser.removeEventListener("pageshow", this, true);
+    aBrowser.removeEventListener("AboutReaderContentReady", this, true);
+    aBrowser.removeEventListener("change", this, true);
+    aBrowser.removeEventListener("input", this, true);
+    aBrowser.removeEventListener("DOMAutoComplete", this, true);
+    aBrowser.removeEventListener("scroll", this, true);
+    aBrowser.removeEventListener("resize", this, true);
+
+    delete aBrowser.__SS_data;
+
+    log("onTabRemove() ran for tab " + aWindow.BrowserApp.getTabForBrowser(aBrowser).id +
+        ", aNoNotification = " + aNoNotification);
+    if (!aNoNotification) {
+      this.saveStateDelayed();
+    }
+  },
+
+  onTabClose: function ss_onTabClose(aWindow, aBrowser, aTabIndex) {
+    if (this._maxTabsUndo == 0) {
+      return;
+    }
+
+    if (aWindow.BrowserApp.tabs.length > 0) {
+      // Bundle this browser's data and extra data and save in the closedTabs
+      // window property
+      let data = aBrowser.__SS_data || {};
+      data.extData = aBrowser.__SS_extdata || {};
+
+      this._windows[aWindow.__SSID].closedTabs.unshift(data);
+      let length = this._windows[aWindow.__SSID].closedTabs.length;
+      if (length > this._maxTabsUndo) {
+        this._windows[aWindow.__SSID].closedTabs.splice(this._maxTabsUndo, length - this._maxTabsUndo);
+      }
+
+      this._lastClosedTabIndex = aTabIndex;
+
+      if (this._notifyClosedTabs) {
+        this._sendClosedTabsToJava(aWindow);
+      }
+
+      log("onTabClose() ran for tab " + aWindow.BrowserApp.getTabForBrowser(aBrowser).id);
+      let evt = new Event("SSTabCloseProcessed", {"bubbles":true, "cancelable":false});
+      aBrowser.dispatchEvent(evt);
+    }
+  },
+
+  onTabLoad: function ss_onTabLoad(aWindow, aBrowser) {
+    // If this browser belongs to a zombie tab or the initial restore hasn't yet finished,
+    // skip any session save activity.
+    if (aBrowser.__SS_restore || !this._startupRestoreFinished || aBrowser.__SS_restoreReloadPending) {
+      return;
+    }
+
+    // Ignore a transient "about:blank"
+    if (!aBrowser.canGoBack && aBrowser.currentURI.spec == "about:blank") {
+      return;
+    }
+
+    let history = aBrowser.sessionHistory;
+
+    // Serialize the tab data
+    let entries = [];
+    let index = history.index + 1;
+    for (let i = 0; i < history.count; i++) {
+      let historyEntry = history.getEntryAtIndex(i, false);
+      // Don't try to restore wyciwyg URLs
+      if (historyEntry.URI.schemeIs("wyciwyg")) {
+        // Adjust the index to account for skipped history entries
+        if (i <= history.index) {
+          index--;
+        }
+        continue;
+      }
+      let entry = this._serializeHistoryEntry(historyEntry);
+      entries.push(entry);
+    }
+    let data = { entries: entries, index: index };
+
+    let formdata;
+    let scrolldata;
+    if (aBrowser.__SS_data) {
+      formdata = aBrowser.__SS_data.formdata;
+      scrolldata = aBrowser.__SS_data.scrolldata;
+    }
+    delete aBrowser.__SS_data;
+
+    this._collectTabData(aWindow, aBrowser, data);
+    if (aBrowser.__SS_restoreDataOnLoad || aBrowser.__SS_restoreDataOnPageshow) {
+      // If the tab has been freshly restored and the "load" or "pageshow"
+      // events haven't yet fired, we need to preserve any form data and
+      // scroll positions that might have been present.
+      aBrowser.__SS_data.formdata = formdata;
+      aBrowser.__SS_data.scrolldata = scrolldata;
+    } else {
+      // When navigating via the forward/back buttons, Gecko restores
+      // the form data all by itself and doesn't invoke any input events.
+      // As _collectTabData() doesn't save any form data, we need to manually
+      // capture it to bridge the time until the next input event arrives.
+      this.onTabInput(aWindow, aBrowser);
+    }
+
+    log("onTabLoad() ran for tab " + aWindow.BrowserApp.getTabForBrowser(aBrowser).id);
+    let evt = new Event("SSTabDataUpdated", {"bubbles":true, "cancelable":false});
+    aBrowser.dispatchEvent(evt);
+    this.saveStateDelayed();
+
+    this._updateCrashReportURL(aWindow);
+  },
+
+  onTabSelect: function ss_onTabSelect(aWindow, aBrowser) {
+    if (this._loadState != STATE_RUNNING) {
+      return;
+    }
+
+    let browsers = aWindow.document.getElementById("browsers");
+    let index = browsers.selectedIndex;
+    this._windows[aWindow.__SSID].selected = parseInt(index) + 1; // 1-based
+
+    let tabId = aWindow.BrowserApp.getTabForBrowser(aBrowser).id;
+
+    // Restore the resurrected browser
+    if (aBrowser.__SS_restore) {
+      if (tabId != this._keepAsZombieTabId) {
+        this._restoreZombieTab(aBrowser, tabId);
+      } else {
+        log("keeping as zombie tab " + tabId);
+      }
+    }
+    // The tab id passed through Tab:KeepZombified is valid for one TabSelect only.
+    this._keepAsZombieTabId = -1;
+
+    log("onTabSelect() ran for tab " + tabId);
+    this.saveStateDelayed();
+    this._updateCrashReportURL(aWindow);
+
+    // If the selected tab has changed while listening for closed tab
+    // notifications, we may have switched between different private browsing
+    // modes.
+    if (this._notifyClosedTabs) {
+      this._sendClosedTabsToJava(aWindow);
+    }
+  },
+
+  _restoreZombieTab: function ss_restoreZombieTab(aBrowser, aTabId) {
+    let data = aBrowser.__SS_data;
+    this._restoreTab(data, aBrowser);
+
+    delete aBrowser.__SS_restore;
+    aBrowser.removeAttribute("pending");
+    log("restoring zombie tab " + aTabId);
+  },
+
+  onTabInput: function ss_onTabInput(aWindow, aBrowser) {
+    // If this browser belongs to a zombie tab or the initial restore hasn't yet finished,
+    // skip any session save activity.
+    if (aBrowser.__SS_restore || !this._startupRestoreFinished || aBrowser.__SS_restoreReloadPending) {
+      return;
+    }
+
+    // Don't bother trying to save text data if we don't have history yet
+    let data = aBrowser.__SS_data;
+    if (!data || data.entries.length == 0) {
+      return;
+    }
+
+    // Start with storing the main content
+    let content = aBrowser.contentWindow;
+
+    // If the main content document has an associated URL that we are not
+    // allowed to store data for, bail out. We explicitly discard data for any
+    // children as well even if storing data for those frames would be allowed.
+    if (!this.checkPrivacyLevel(content.document.documentURI)) {
+      return;
+    }
+
+    // Store the main content
+    let formdata = FormData.collect(content) || {};
+
+    // Loop over direct child frames, and store the text data
+    let children = [];
+    for (let i = 0; i < content.frames.length; i++) {
+      let frame = content.frames[i];
+      if (!this.checkPrivacyLevel(frame.document.documentURI)) {
+        continue;
+      }
+
+      let result = FormData.collect(frame);
+      if (result && Object.keys(result).length) {
+        children[i] = result;
+      }
+    }
+
+    // If any frame had text data, add it to the main form data
+    if (children.length) {
+      formdata.children = children;
+    }
+
+    // If we found any form data, main content or frames, let's save it
+    if (Object.keys(formdata).length) {
+      data.formdata = formdata;
+      log("onTabInput() ran for tab " + aWindow.BrowserApp.getTabForBrowser(aBrowser).id);
+      this.saveStateDelayed();
+    }
+  },
+
+  onTabScroll: function ss_onTabScroll(aWindow, aBrowser) {
+    // If we've been called directly, cancel any pending timeouts.
+    if (this._scrollSavePending) {
+      aWindow.clearTimeout(this._scrollSavePending);
+      this._scrollSavePending = null;
+      log("onTabScroll() clearing pending timeout");
+    }
+
+    // If this browser belongs to a zombie tab or the initial restore hasn't yet finished,
+    // skip any session save activity.
+    if (aBrowser.__SS_restore || !this._startupRestoreFinished || aBrowser.__SS_restoreReloadPending) {
+      return;
+    }
+
+    // Don't bother trying to save scroll positions if we don't have history yet.
+    let data = aBrowser.__SS_data;
+    if (!data || data.entries.length == 0) {
+      return;
+    }
+
+    // Neither bother if we're yet to restore the previous scroll position.
+    if (aBrowser.__SS_restoreDataOnLoad || aBrowser.__SS_restoreDataOnPageshow) {
+      return;
+    }
+
+    // Start with storing the main content.
+    let content = aBrowser.contentWindow;
+
+    // Store the main content.
+    let scrolldata = ScrollPosition.collect(content) || {};
+
+    // Loop over direct child frames, and store the scroll positions.
+    let children = [];
+    for (let i = 0; i < content.frames.length; i++) {
+      let frame = content.frames[i];
+
+      let result = ScrollPosition.collect(frame);
+      if (result && Object.keys(result).length) {
+        children[i] = result;
+      }
+    }
+
+    // If any frame had scroll positions, add them to the main scroll data.
+    if (children.length) {
+      scrolldata.children = children;
+    }
+
+    // Save the current document resolution.
+    let zoom = { value: 1 };
+    content.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(
+      Ci.nsIDOMWindowUtils).getResolution(zoom);
+    scrolldata.zoom = {};
+    scrolldata.zoom.resolution = zoom.value;
+    log("onTabScroll() zoom level: " + zoom.value);
+
+    // Save some data that'll help in adjusting the zoom level
+    // when restoring in a different screen orientation.
+    scrolldata.zoom.displaySize = this._getContentViewerSize(content);
+    log("onTabScroll() displayWidth: " + scrolldata.zoom.displaySize.width);
+
+    // Save zoom and scroll data.
+    data.scrolldata = scrolldata;
+    log("onTabScroll() ran for tab " + aWindow.BrowserApp.getTabForBrowser(aBrowser).id);
+    let evt = new Event("SSTabScrollCaptured", {"bubbles":true, "cancelable":false});
+    aBrowser.dispatchEvent(evt);
+    this.saveStateDelayed();
+  },
+
+  _getContentViewerSize: function ss_getContentViewerSize(aWindow) {
+    let displaySize = {};
+    let width = {}, height = {};
+    aWindow.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(
+      Ci.nsIDOMWindowUtils).getContentViewerSize(width, height);
+
+    displaySize.width = width.value;
+    displaySize.height = height.value;
+
+    return displaySize;
+  },
+
+  saveStateDelayed: function ss_saveStateDelayed() {
+    if (!this._saveTimer) {
+      // Interval until the next disk operation is allowed
+      let currentDelay = this._lastSaveTime + this._interval - Date.now();
+
+      // If we have to wait, set a timer, otherwise saveState directly
+      let delay = Math.max(currentDelay, this._minSaveDelay);
+      if (delay > 0) {
+        this._pendingWrite++;
+        this._saveTimer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+        this._saveTimer.init(this, delay, Ci.nsITimer.TYPE_ONE_SHOT);
+        log("saveStateDelayed() timer delay = " + delay +
+             ", incrementing _pendingWrite to " + this._pendingWrite);
+      } else {
+        log("saveStateDelayed() no delay");
+        this.saveState();
+      }
+    } else {
+      log("saveStateDelayed() timer already running, taking no action");
+    }
+  },
+
+  saveState: function ss_saveState() {
+    this._pendingWrite++;
+    log("saveState(), incrementing _pendingWrite to " + this._pendingWrite);
+    this._saveState(true);
+  },
+
+  // Immediately and synchronously writes any pending state to disk.
+  flushPendingState: function ss_flushPendingState() {
+    log("flushPendingState(), _pendingWrite = " + this._pendingWrite);
+    if (this._pendingWrite) {
+      this._saveState(false);
+    }
+  },
+
+  _saveState: function ss_saveState(aAsync) {
+    log("_saveState(aAsync = " + aAsync + ")");
+    // Kill any queued timer and save immediately
+    if (this._saveTimer) {
+      this._saveTimer.cancel();
+      this._saveTimer = null;
+      log("_saveState() killed queued timer");
+    }
+
+    // Periodically save a "known good" copy of the session store data.
+    if (!this._writeInProgress && Date.now() - this._lastBackupTime > this._backupInterval &&
+         this._sessionDataIsGood && this._sessionFile.exists()) {
+      if (this._sessionFileBackup.exists()) {
+        this._sessionFileBackup.remove(false);
+      }
+
+      log("_saveState() backing up session data");
+      this._sessionFile.copyTo(null, this._sessionFileBackup.leafName);
+      this._lastBackupTime = Date.now();
+    }
+
+    let data = this._getCurrentState();
+    let normalData = { windows: [] };
+    let privateData = { windows: [] };
+    log("_saveState() current state collected");
+
+    for (let winIndex = 0; winIndex < data.windows.length; ++winIndex) {
+      let win = data.windows[winIndex];
+      let normalWin = {};
+      for (let prop in win) {
+        normalWin[prop] = data[prop];
+      }
+      normalWin.tabs = [];
+
+      // Save normal closed tabs. Forget about private closed tabs.
+      normalWin.closedTabs = win.closedTabs.filter(tab => !tab.isPrivate);
+
+      normalData.windows.push(normalWin);
+      privateData.windows.push({ tabs: [] });
+
+      // Split the session data into private and non-private data objects.
+      // Non-private session data will be saved to disk, and private session
+      // data will be sent to Java for Android to hold it in memory.
+      for (let i = 0; i < win.tabs.length; ++i) {
+        let tab = win.tabs[i];
+        let savedWin = tab.isPrivate ? privateData.windows[winIndex] : normalData.windows[winIndex];
+        savedWin.tabs.push(tab);
+        if (win.selected == i + 1) {
+          savedWin.selected = savedWin.tabs.length;
+        }
+      }
+    }
+
+    // Write only non-private data to disk
+    if (normalData.windows[0] && normalData.windows[0].tabs) {
+      log("_saveState() writing normal data, " +
+           normalData.windows[0].tabs.length + " tabs in window[0]");
+    } else {
+      log("_saveState() writing empty normal data");
+    }
+    this._writeFile(this._sessionFile, this._sessionFileTemp, normalData, aAsync);
+
+    // If we have private data, send it to Java; otherwise, send null to
+    // indicate that there is no private data
+    Messaging.sendRequest({
+      type: "PrivateBrowsing:Data",
+      session: (privateData.windows.length > 0 && privateData.windows[0].tabs.length > 0) ? JSON.stringify(privateData) : null
+    });
+
+    this._lastSaveTime = Date.now();
+  },
+
+  _getCurrentState: function ss_getCurrentState() {
+    let self = this;
+    this._forEachBrowserWindow(function(aWindow) {
+      self._collectWindowData(aWindow);
+    });
+
+    let data = { windows: [] };
+    for (let index in this._windows) {
+      data.windows.push(this._windows[index]);
+    }
+
+    return data;
+  },
+
+  _collectTabData: function ss__collectTabData(aWindow, aBrowser, aHistory) {
+    // If this browser is being restored, skip any session save activity
+    if (aBrowser.__SS_restore) {
+      return;
+    }
+
+    aHistory = aHistory || { entries: [{ url: aBrowser.currentURI.spec, title: aBrowser.contentTitle }], index: 1 };
+
+    let tabData = {};
+    tabData.entries = aHistory.entries;
+    tabData.index = aHistory.index;
+    tabData.attributes = { image: aBrowser.mIconURL };
+    tabData.desktopMode = aWindow.BrowserApp.getTabForBrowser(aBrowser).desktopMode;
+    tabData.isPrivate = aBrowser.docShell.QueryInterface(Ci.nsILoadContext).usePrivateBrowsing;
+
+    aBrowser.__SS_data = tabData;
+  },
+
+  _collectWindowData: function ss__collectWindowData(aWindow) {
+    // Ignore windows not tracked by SessionStore
+    if (!aWindow.__SSID || !this._windows[aWindow.__SSID]) {
+      return;
+    }
+
+    let winData = this._windows[aWindow.__SSID];
+    winData.tabs = [];
+
+    let browsers = aWindow.document.getElementById("browsers");
+    let index = browsers.selectedIndex;
+    winData.selected = parseInt(index) + 1; // 1-based
+
+    let tabs = aWindow.BrowserApp.tabs;
+    for (let i = 0; i < tabs.length; i++) {
+      let browser = tabs[i].browser;
+      if (browser.__SS_data) {
+        let tabData = browser.__SS_data;
+        if (browser.__SS_extdata) {
+          tabData.extData = browser.__SS_extdata;
+        }
+        winData.tabs.push(tabData);
+      }
+    }
+  },
+
+  _forEachBrowserWindow: function ss_forEachBrowserWindow(aFunc) {
+    let windowsEnum = Services.wm.getEnumerator("navigator:browser");
+    while (windowsEnum.hasMoreElements()) {
+      let window = windowsEnum.getNext();
+      if (window.__SSID && !window.closed) {
+        aFunc.call(this, window);
+      }
+    }
+  },
+
+  /**
+   * Writes the session state to a disk file, while doing some telemetry and notification
+   * bookkeeping.
+   * @param aFile nsIFile used for saving the session
+   * @param aFileTemp nsIFile used as a temporary file in writing the data
+   * @param aData JSON session state
+   * @param aAsync boolelan used to determine the method of saving the state
+   */
+  _writeFile: function ss_writeFile(aFile, aFileTemp, aData, aAsync) {
+    TelemetryStopwatch.start("FX_SESSION_RESTORE_SERIALIZE_DATA_MS");
+    let state = JSON.stringify(aData);
+    TelemetryStopwatch.finish("FX_SESSION_RESTORE_SERIALIZE_DATA_MS");
+
+    // Convert data string to a utf-8 encoded array buffer
+    let buffer = new TextEncoder().encode(state);
+    Services.telemetry.getHistogramById("FX_SESSION_RESTORE_FILE_SIZE_BYTES").add(buffer.byteLength);
+
+    Services.obs.notifyObservers(null, "sessionstore-state-write", "");
+    let startWriteMs = Cu.now();
+
+    log("_writeFile(aAsync = " + aAsync + "), _pendingWrite = " + this._pendingWrite);
+    this._writeInProgress = true;
+    let pendingWrite = this._pendingWrite;
+    this._write(aFile, aFileTemp, buffer, aAsync).then(() => {
+      let stopWriteMs = Cu.now();
+
+      // Make sure this._pendingWrite is the same value it was before we
+      // fired off the async write. If the count is different, another write
+      // is pending, so we shouldn't reset this._pendingWrite yet.
+      if (pendingWrite === this._pendingWrite) {
+        this._pendingWrite = 0;
+        this._writeInProgress = false;
+      }
+
+      log("_writeFile() _write() returned, _pendingWrite = " + this._pendingWrite);
+
+      // We don't use a stopwatch here since the calls are async and stopwatches can only manage
+      // a single timer per histogram.
+      Services.telemetry.getHistogramById("FX_SESSION_RESTORE_WRITE_FILE_MS").add(Math.round(stopWriteMs - startWriteMs));
+      Services.obs.notifyObservers(null, "sessionstore-state-write-complete", "");
+      this._sessionDataIsGood = true;
+    });
+  },
+
+  /**
+   * Writes the session state to a disk file, using async or sync methods
+   * @param aFile nsIFile used for saving the session
+   * @param aFileTemp nsIFile used as a temporary file in writing the data
+   * @param aBuffer UTF-8 encoded ArrayBuffer of the session state
+   * @param aAsync boolelan used to determine the method of saving the state
+   * @return Promise that resolves when the file has been written
+   */
+  _write: function ss_write(aFile, aFileTemp, aBuffer, aAsync) {
+    // Use async file writer and just return it's promise
+    if (aAsync) {
+      log("_write() writing asynchronously");
+      return OS.File.writeAtomic(aFile.path, aBuffer, { tmpPath: aFileTemp.path });
+    }
+
+    // Convert buffer to an encoded string and sync write to disk
+    let bytes = String.fromCharCode.apply(null, new Uint16Array(aBuffer));
+    let stream = Cc["@mozilla.org/network/file-output-stream;1"].createInstance(Ci.nsIFileOutputStream);
+    stream.init(aFileTemp, 0x02 | 0x08 | 0x20, 0o666, 0);
+    stream.write(bytes, bytes.length);
+    stream.close();
+    // Mimic writeAtomic behaviour when tmpPath is set and write
+    // to a temp file which is then renamed at the end.
+    aFileTemp.renameTo(null, aFile.leafName);
+    log("_write() writing synchronously");
+
+    // Return a resolved promise to make the caller happy
+    return Promise.resolve();
+  },
+
+  _updateCrashReportURL: function ss_updateCrashReportURL(aWindow) {
+    let crashReporterBuilt = "nsICrashReporter" in Ci && Services.appinfo instanceof Ci.nsICrashReporter;
+    if (!crashReporterBuilt) {
+      return;
+    }
+
+    if (!aWindow.BrowserApp.selectedBrowser) {
+      return;
+    }
+
+    try {
+      let currentURI = aWindow.BrowserApp.selectedBrowser.currentURI.clone();
+      // if the current URI contains a username/password, remove it
+      try {
+        currentURI.userPass = "";
+      } catch (ex) { } // ignore failures on about: URIs
+
+      Services.appinfo.annotateCrashReport("URL", currentURI.spec);
+    } catch (ex) {
+      // don't make noise when crashreporter is built but not enabled
+      if (ex.result != Cr.NS_ERROR_NOT_INITIALIZED) {
+        Cu.reportError("SessionStore:" + ex);
+      }
+    }
+  },
+
+  /**
+   * Determines whether a given session history entry has been added dynamically.
+   */
+  isDynamic: function(aEntry) {
+    // aEntry.isDynamicallyAdded() is true for dynamically added
+    // <iframe> and <frameset>, but also for <html> (the root of the
+    // document) so we use aEntry.parent to ensure that we're not looking
+    // at the root of the document
+    return aEntry.parent && aEntry.isDynamicallyAdded();
+  },
+
+  /**
+  * Get an object that is a serialized representation of a History entry.
+  */
+  _serializeHistoryEntry: function _serializeHistoryEntry(aEntry) {
+    let entry = { url: aEntry.URI.spec };
+
+    if (aEntry.title && aEntry.title != entry.url) {
+      entry.title = aEntry.title;
+    }
+
+    if (!(aEntry instanceof Ci.nsISHEntry)) {
+      return entry;
+    }
+
+    let cacheKey = aEntry.cacheKey;
+    if (cacheKey && cacheKey instanceof Ci.nsISupportsPRUint32 && cacheKey.data != 0) {
+      entry.cacheKey = cacheKey.data;
+    }
+
+    entry.ID = aEntry.ID;
+    entry.docshellID = aEntry.docshellID;
+
+    if (aEntry.referrerURI) {
+      entry.referrer = aEntry.referrerURI.spec;
+    }
+
+    if (aEntry.originalURI) {
+      entry.originalURI = aEntry.originalURI.spec;
+    }
+
+    if (aEntry.loadReplace) {
+      entry.loadReplace = aEntry.loadReplace;
+    }
+
+    if (aEntry.contentType) {
+      entry.contentType = aEntry.contentType;
+    }
+
+    if (aEntry.scrollRestorationIsManual) {
+      entry.scrollRestorationIsManual = true;
+    } else {
+      let x = {}, y = {};
+      aEntry.getScrollPosition(x, y);
+      if (x.value != 0 || y.value != 0) {
+        entry.scroll = x.value + "," + y.value;
+      }
+    }
+
+    // Collect triggeringPrincipal data for the current history entry.
+    // Please note that before Bug 1297338 there was no concept of a
+    // principalToInherit. To remain backward/forward compatible we
+    // serialize the principalToInherit as triggeringPrincipal_b64.
+    // Once principalToInherit is well established (within FF55)
+    // we can update this code, remove triggeringPrincipal_b64 and
+    // just keep triggeringPrincipal_base64 as well as
+    // principalToInherit_base64;  see Bug 1301666.
+    if (aEntry.principalToInherit) {
+      try {
+        let principalToInherit = Utils.serializePrincipal(aEntry.principalToInherit);
+        if (principalToInherit) {
+          entry.triggeringPrincipal_b64 = principalToInherit;
+          entry.principalToInherit_base64 = principalToInherit;
+        }
+      } catch (e) {
+        dump(e);
+      }
+    }
+
+    if (aEntry.triggeringPrincipal) {
+      try {
+        let triggeringPrincipal = Utils.serializePrincipal(aEntry.triggeringPrincipal);
+        if (triggeringPrincipal) {
+          entry.triggeringPrincipal_base64 = triggeringPrincipal;
+        }
+      } catch (e) {
+        dump(e);
+      }
+    }
+
+    entry.docIdentifier = aEntry.BFCacheEntry.ID;
+
+    if (aEntry.stateData != null) {
+      entry.structuredCloneState = aEntry.stateData.getDataAsBase64();
+      entry.structuredCloneVersion = aEntry.stateData.formatVersion;
+    }
+
+    if (!(aEntry instanceof Ci.nsISHContainer)) {
+      return entry;
+    }
+
+    if (aEntry.childCount > 0) {
+      let children = [];
+      for (let i = 0; i < aEntry.childCount; i++) {
+        let child = aEntry.GetChildAt(i);
+
+        if (child && !this.isDynamic(child)) {
+          // don't try to restore framesets containing wyciwyg URLs (cf. bug 424689 and bug 450595)
+          if (child.URI.schemeIs("wyciwyg")) {
+            children = [];
+            break;
+          }
+          children.push(this._serializeHistoryEntry(child));
+        }
+      }
+
+      if (children.length) {
+        entry.children = children;
+      }
+    }
+
+    return entry;
+  },
+
+  _deserializeHistoryEntry: function _deserializeHistoryEntry(aEntry, aIdMap, aDocIdentMap) {
+    let shEntry = Cc["@mozilla.org/browser/session-history-entry;1"].createInstance(Ci.nsISHEntry);
+
+    shEntry.setURI(Services.io.newURI(aEntry.url, null, null));
+    shEntry.setTitle(aEntry.title || aEntry.url);
+    if (aEntry.subframe) {
+      shEntry.setIsSubFrame(aEntry.subframe || false);
+    }
+    shEntry.loadType = Ci.nsIDocShellLoadInfo.loadHistory;
+    if (aEntry.contentType) {
+      shEntry.contentType = aEntry.contentType;
+    }
+    if (aEntry.referrer) {
+      shEntry.referrerURI = Services.io.newURI(aEntry.referrer, null, null);
+    }
+
+    if (aEntry.originalURI) {
+      shEntry.originalURI =  Services.io.newURI(aEntry.originalURI, null, null);
+    }
+
+    if (aEntry.loadReplace) {
+      shEntry.loadReplace = aEntry.loadReplace;
+    }
+
+    if (aEntry.cacheKey) {
+      let cacheKey = Cc["@mozilla.org/supports-PRUint32;1"].createInstance(Ci.nsISupportsPRUint32);
+      cacheKey.data = aEntry.cacheKey;
+      shEntry.cacheKey = cacheKey;
+    }
+
+    if (aEntry.ID) {
+      // get a new unique ID for this frame (since the one from the last
+      // start might already be in use)
+      let id = aIdMap[aEntry.ID] || 0;
+      if (!id) {
+        for (id = Date.now(); id in aIdMap.used; id++);
+        aIdMap[aEntry.ID] = id;
+        aIdMap.used[id] = true;
+      }
+      shEntry.ID = id;
+    }
+
+    if (aEntry.docshellID) {
+      shEntry.docshellID = aEntry.docshellID;
+    }
+
+    if (aEntry.structuredCloneState && aEntry.structuredCloneVersion) {
+      shEntry.stateData =
+        Cc["@mozilla.org/docshell/structured-clone-container;1"].
+        createInstance(Ci.nsIStructuredCloneContainer);
+
+      shEntry.stateData.initFromBase64(aEntry.structuredCloneState, aEntry.structuredCloneVersion);
+    }
+
+    if (aEntry.scrollRestorationIsManual) {
+      shEntry.scrollRestorationIsManual = true;
+    } else if (aEntry.scroll) {
+      let scrollPos = aEntry.scroll.split(",");
+      scrollPos = [parseInt(scrollPos[0]) || 0, parseInt(scrollPos[1]) || 0];
+      shEntry.setScrollPosition(scrollPos[0], scrollPos[1]);
+    }
+
+    let childDocIdents = {};
+    if (aEntry.docIdentifier) {
+      // If we have a serialized document identifier, try to find an SHEntry
+      // which matches that doc identifier and adopt that SHEntry's
+      // BFCacheEntry.  If we don't find a match, insert shEntry as the match
+      // for the document identifier.
+      let matchingEntry = aDocIdentMap[aEntry.docIdentifier];
+      if (!matchingEntry) {
+        matchingEntry = {shEntry: shEntry, childDocIdents: childDocIdents};
+        aDocIdentMap[aEntry.docIdentifier] = matchingEntry;
+      } else {
+        shEntry.adoptBFCacheEntry(matchingEntry.shEntry);
+        childDocIdents = matchingEntry.childDocIdents;
+      }
+    }
+
+    // The field aEntry.owner_b64 got renamed to aEntry.triggeringPricipal_b64 in
+    // Bug 1286472. To remain backward compatible we still have to support that
+    // field for a few cycles before we can remove it within Bug 1289785.
+    if (aEntry.owner_b64) {
+      aEntry.triggeringPricipal_b64 = aEntry.owner_b64;
+      delete aEntry.owner_b64;
+    }
+
+    // Before introducing the concept of principalToInherit we only had
+    // a triggeringPrincipal within every entry which basically is the
+    // equivalent of the new principalToInherit. To avoid compatibility
+    // issues, we first check if the entry has entries for
+    // triggeringPrincipal_base64 and principalToInherit_base64. If not
+    // we fall back to using the principalToInherit (which is stored
+    // as triggeringPrincipal_b64) as the triggeringPrincipal and
+    // the principalToInherit.
+    // FF55 will remove the triggeringPrincipal_b64, see Bug 1301666.
+    if (aEntry.triggeringPrincipal_base64 || aEntry.principalToInherit_base64) {
+      if (aEntry.triggeringPrincipal_base64) {
+        shEntry.triggeringPrincipal =
+          Utils.deserializePrincipal(aEntry.triggeringPrincipal_base64);
+      }
+      if (aEntry.principalToInherit_base64) {
+        shEntry.principalToInherit =
+          Utils.deserializePrincipal(aEntry.principalToInherit_base64);
+      }
+    } else if (aEntry.triggeringPrincipal_b64) {
+      shEntry.triggeringPrincipal = Utils.deserializePrincipal(aEntry.triggeringPrincipal_b64);
+      shEntry.principalToInherit = shEntry.triggeringPrincipal;
+    }
+
+    if (aEntry.children && shEntry instanceof Ci.nsISHContainer) {
+      for (let i = 0; i < aEntry.children.length; i++) {
+        if (!aEntry.children[i].url) {
+          continue;
+        }
+
+        // We're getting sessionrestore.js files with a cycle in the
+        // doc-identifier graph, likely due to bug 698656.  (That is, we have
+        // an entry where doc identifier A is an ancestor of doc identifier B,
+        // and another entry where doc identifier B is an ancestor of A.)
+        //
+        // If we were to respect these doc identifiers, we'd create a cycle in
+        // the SHEntries themselves, which causes the docshell to loop forever
+        // when it looks for the root SHEntry.
+        //
+        // So as a hack to fix this, we restrict the scope of a doc identifier
+        // to be a node's siblings and cousins, and pass childDocIdents, not
+        // aDocIdents, to _deserializeHistoryEntry.  That is, we say that two
+        // SHEntries with the same doc identifier have the same document iff
+        // they have the same parent or their parents have the same document.
+
+        shEntry.AddChild(this._deserializeHistoryEntry(aEntry.children[i], aIdMap, childDocIdents), i);
+      }
+    }
+
+    return shEntry;
+  },
+
+  // This function iterates through a list of urls opening a new tab for each.
+  _openTabs: function ss_openTabs(aData) {
+    let window = Services.wm.getMostRecentWindow("navigator:browser");
+    for (let i = 0; i < aData.urls.length; i++) {
+      let url = aData.urls[i];
+      let params = {
+        selected: (i == aData.urls.length - 1),
+        isPrivate: false,
+        desktopMode: false,
+      };
+
+      let tab = window.BrowserApp.addTab(url, params);
+    }
+  },
+
+  // This function iterates through a list of tab data restoring session for each of them.
+  _restoreTabs: function ss_restoreTabs(aData) {
+    let window = Services.wm.getMostRecentWindow("navigator:browser");
+    for (let i = 0; i < aData.tabs.length; i++) {
+      let tabData = JSON.parse(aData.tabs[i]);
+      let isSelectedTab = (i == aData.tabs.length - 1);
+      let params = {
+        selected: isSelectedTab,
+        isPrivate: tabData.isPrivate,
+        desktopMode: tabData.desktopMode,
+        cancelEditMode: isSelectedTab
+      };
+
+      let tab = window.BrowserApp.addTab(tabData.entries[tabData.index - 1].url, params);
+      tab.browser.__SS_data = tabData;
+      tab.browser.__SS_extdata = tabData.extData;
+      this._restoreTab(tabData, tab.browser);
+    }
+  },
+
+  /**
+   * Don't save sensitive data if the user doesn't want to
+   * (distinguishes between encrypted and non-encrypted sites)
+   */
+  checkPrivacyLevel: function ss_checkPrivacyLevel(aURL) {
+    let isHTTPS = aURL.startsWith("https:");
+    let pref = "browser.sessionstore.privacy_level";
+    return Services.prefs.getIntPref(pref) < (isHTTPS ? PRIVACY_ENCRYPTED : PRIVACY_FULL);
+  },
+
+  /**
+  * Starts the restoration process for a browser. History is restored at this
+  * point, but text data must be delayed until the content loads.
+  */
+  _restoreTab: function ss_restoreTab(aTabData, aBrowser) {
+    // aTabData shouldn't be empty here, but if it is,
+    // _restoreHistory() will crash otherwise.
+    if (!aTabData || aTabData.entries.length == 0) {
+      Cu.reportError("SessionStore.js: Error trying to restore tab with empty tabdata");
+      return;
+    }
+    this._restoreHistory(aTabData, aBrowser.sessionHistory);
+
+    // Various bits of state can only be restored if page loading has progressed far enough:
+    // The MobileViewportManager needs to be told as early as possible about
+    // our desired zoom level so it can take it into account during the
+    // initial document resolution calculation.
+    aBrowser.__SS_restoreDataOnLocationChange = true;
+    // Restoring saved form data requires the input fields to be available,
+    // so we have to wait for the content to load.
+    aBrowser.__SS_restoreDataOnLoad = true;
+    // Restoring the scroll position depends on the document resolution having been set,
+    // which is only guaranteed to have happened *after* we receive the load event.
+    aBrowser.__SS_restoreDataOnPageshow = true;
+  },
+
+  /**
+  * Takes serialized history data and create news entries into the given
+  * nsISessionHistory object.
+  */
+  _restoreHistory: function ss_restoreHistory(aTabData, aHistory) {
+    if (aHistory.count > 0) {
+      aHistory.PurgeHistory(aHistory.count);
+    }
+    aHistory.QueryInterface(Ci.nsISHistoryInternal);
+
+    // Helper hashes for ensuring unique frame IDs and unique document
+    // identifiers.
+    let idMap = { used: {} };
+    let docIdentMap = {};
+
+    for (let i = 0; i < aTabData.entries.length; i++) {
+      if (!aTabData.entries[i].url) {
+        continue;
+      }
+      aHistory.addEntry(this._deserializeHistoryEntry(aTabData.entries[i], idMap, docIdentMap), true);
+    }
+
+    // We need to force set the active history item and cause it to reload since
+    // we stop the load above
+    let activeIndex = (aTabData.index || aTabData.entries.length) - 1;
+    aHistory.getEntryAtIndex(activeIndex, true);
+
+    try {
+      aHistory.QueryInterface(Ci.nsISHistory).reloadCurrentEntry();
+    } catch (e) {
+      // This will throw if the current entry is an error page.
+    }
+  },
+
+  /**
+  * Takes serialized form text data and restores it into the given browser.
+  */
+  _restoreTextData: function ss_restoreTextData(aFormData, aBrowser) {
+    if (aFormData) {
+      log("_restoreTextData()");
+      FormData.restoreTree(aBrowser.contentWindow, aFormData);
+    }
+  },
+
+  /**
+   * Restores the zoom level of the window. This needs to be called before
+   * first paint/load (whichever comes first) to take any effect.
+   */
+  _restoreZoom: function ss_restoreZoom(aScrollData, aBrowser) {
+    if (aScrollData && aScrollData.zoom && aScrollData.zoom.displaySize) {
+      log("_restoreZoom(), resolution: " + aScrollData.zoom.resolution +
+          ", old displayWidth: " + aScrollData.zoom.displaySize.width);
+
+      let utils = aBrowser.contentWindow.QueryInterface(
+        Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+      // Restore zoom level.
+      utils.setRestoreResolution(aScrollData.zoom.resolution,
+                                 aScrollData.zoom.displaySize.width,
+                                 aScrollData.zoom.displaySize.height);
+    }
+  },
+
+  /**
+  * Takes serialized scroll positions and restores them into the given browser.
+  */
+  _restoreScrollPosition: function ss_restoreScrollPosition(aScrollData, aBrowser) {
+    if (aScrollData) {
+      log("_restoreScrollPosition()");
+      ScrollPosition.restoreTree(aBrowser.contentWindow, aScrollData);
+    }
+  },
+
+  getBrowserState: function ss_getBrowserState() {
+    return this._getCurrentState();
+  },
+
+  _restoreWindow: function ss_restoreWindow(aData) {
+    let state;
+    try {
+      state = JSON.parse(aData);
+    } catch (e) {
+      throw "Invalid session JSON: " + aData;
+    }
+
+    // To do a restore, we must have at least one window with one tab
+    if (!state || state.windows.length == 0 || !state.windows[0].tabs || state.windows[0].tabs.length == 0) {
+      throw "Invalid session JSON: " + aData;
+    }
+
+    let window = Services.wm.getMostRecentWindow("navigator:browser");
+
+    let tabs = state.windows[0].tabs;
+    let selected = state.windows[0].selected;
+    log("_restoreWindow() selected tab in aData is " + selected + " of " + tabs.length)
+    if (selected == null || selected > tabs.length) { // Clamp the selected index if it's bogus
+      log("_restoreWindow() resetting selected tab");
+      selected = 1;
+    }
+    log("restoreWindow() window.BrowserApp.selectedTab is " + window.BrowserApp.selectedTab.id);
+
+    for (let i = 0; i < tabs.length; i++) {
+      let tabData = tabs[i];
+      let entry = tabData.entries[tabData.index - 1];
+
+      // Use stubbed tab if we've already created it; otherwise, make a new tab
+      let tab;
+      if (tabData.tabId == null) {
+        let params = {
+          selected: (selected == i+1),
+          delayLoad: true,
+          title: entry.title,
+          desktopMode: (tabData.desktopMode == true),
+          isPrivate: (tabData.isPrivate == true)
+        };
+        tab = window.BrowserApp.addTab(entry.url, params);
+      } else {
+        tab = window.BrowserApp.getTabForId(tabData.tabId);
+        delete tabData.tabId;
+
+        // Don't restore tab if user has closed it
+        if (tab == null) {
+          continue;
+        }
+      }
+
+      tab.browser.__SS_data = tabData;
+      tab.browser.__SS_extdata = tabData.extData;
+
+      if (window.BrowserApp.selectedTab == tab) {
+        this._restoreTab(tabData, tab.browser);
+
+        // We can now lift the general ban on tab data capturing,
+        // but we still need to protect the foreground tab until we're
+        // sure it's actually reloading after history restoring has finished.
+        tab.browser.__SS_restoreReloadPending = true;
+        this._startupRestoreFinished = true;
+        log("startupRestoreFinished = true");
+
+        delete tab.browser.__SS_restore;
+        tab.browser.removeAttribute("pending");
+      } else {
+        // Mark the browser for delay loading
+        tab.browser.__SS_restore = true;
+        tab.browser.setAttribute("pending", "true");
+      }
+    }
+
+    // Restore the closed tabs array on the current window.
+    if (state.windows[0].closedTabs) {
+      this._windows[window.__SSID].closedTabs = state.windows[0].closedTabs;
+      log("_restoreWindow() loaded " + state.windows[0].closedTabs.length + " closed tabs");
+    }
+  },
+
+  getClosedTabCount: function ss_getClosedTabCount(aWindow) {
+    if (!aWindow || !aWindow.__SSID || !this._windows[aWindow.__SSID]) {
+      return 0; // not a browser window, or not otherwise tracked by SS.
+    }
+
+    return this._windows[aWindow.__SSID].closedTabs.length;
+  },
+
+  getClosedTabs: function ss_getClosedTabs(aWindow) {
+    if (!aWindow.__SSID) {
+      throw (Components.returnCode = Cr.NS_ERROR_INVALID_ARG);
+    }
+
+    return this._windows[aWindow.__SSID].closedTabs;
+  },
+
+  undoCloseTab: function ss_undoCloseTab(aWindow, aCloseTabData) {
+    if (!aWindow.__SSID) {
+      throw (Components.returnCode = Cr.NS_ERROR_INVALID_ARG);
+    }
+
+    let closedTabs = this._windows[aWindow.__SSID].closedTabs;
+    if (!closedTabs) {
+      return null;
+    }
+
+    // If the tab data is in the closedTabs array, remove it.
+    closedTabs.find(function (tabData, i) {
+      if (tabData == aCloseTabData) {
+        closedTabs.splice(i, 1);
+        return true;
+      }
+    });
+
+    // create a new tab and bring to front
+    let params = {
+      selected: true,
+      isPrivate: aCloseTabData.isPrivate,
+      desktopMode: aCloseTabData.desktopMode,
+      tabIndex: this._lastClosedTabIndex
+    };
+    let tab = aWindow.BrowserApp.addTab(aCloseTabData.entries[aCloseTabData.index - 1].url, params);
+    tab.browser.__SS_data = aCloseTabData;
+    tab.browser.__SS_extdata = aCloseTabData.extData;
+    this._restoreTab(aCloseTabData, tab.browser);
+
+    this._lastClosedTabIndex = -1;
+
+    if (this._notifyClosedTabs) {
+      this._sendClosedTabsToJava(aWindow);
+    }
+
+    return tab.browser;
+  },
+
+  forgetClosedTab: function ss_forgetClosedTab(aWindow, aIndex) {
+    if (!aWindow.__SSID) {
+      throw (Components.returnCode = Cr.NS_ERROR_INVALID_ARG);
+    }
+
+    let closedTabs = this._windows[aWindow.__SSID].closedTabs;
+
+    // default to the most-recently closed tab
+    aIndex = aIndex || 0;
+    if (!(aIndex in closedTabs)) {
+      throw (Components.returnCode = Cr.NS_ERROR_INVALID_ARG);
+    }
+
+    // remove closed tab from the array
+    closedTabs.splice(aIndex, 1);
+
+    // Forget the last closed tab index if we're forgetting the last closed tab.
+    if (aIndex == 0) {
+      this._lastClosedTabIndex = -1;
+    }
+    if (this._notifyClosedTabs) {
+      this._sendClosedTabsToJava(aWindow);
+    }
+  },
+
+  _sendClosedTabsToJava: function ss_sendClosedTabsToJava(aWindow) {
+    if (!aWindow.__SSID) {
+      throw (Components.returnCode = Cr.NS_ERROR_INVALID_ARG);
+    }
+
+    let closedTabs = this._windows[aWindow.__SSID].closedTabs;
+    let isPrivate = PrivateBrowsingUtils.isBrowserPrivate(aWindow.BrowserApp.selectedBrowser);
+
+    let tabs = closedTabs
+      .filter(tab => tab.isPrivate == isPrivate)
+      .map(function (tab) {
+        // Get the url and title for the last entry in the session history.
+        let lastEntry = tab.entries[tab.entries.length - 1];
+        return {
+          url: lastEntry.url,
+          title: lastEntry.title || "",
+          data: tab
+        };
+      });
+
+    log("sending " + tabs.length + " closed tabs to Java");
+    Messaging.sendRequest({
+      type: "ClosedTabs:Data",
+      tabs: tabs
+    });
+  },
+
+  getTabValue: function ss_getTabValue(aTab, aKey) {
+    let browser = aTab.browser;
+    let data = browser.__SS_extdata || {};
+    return data[aKey] || "";
+  },
+
+  setTabValue: function ss_setTabValue(aTab, aKey, aStringValue) {
+    let browser = aTab.browser;
+    if (!browser.__SS_extdata) {
+      browser.__SS_extdata = {};
+    }
+    browser.__SS_extdata[aKey] = aStringValue;
+    this.saveStateDelayed();
+  },
+
+  deleteTabValue: function ss_deleteTabValue(aTab, aKey) {
+    let browser = aTab.browser;
+    if (browser.__SS_extdata && aKey in browser.__SS_extdata) {
+      delete browser.__SS_extdata[aKey];
+      this.saveStateDelayed();
+    }
+  },
+
+  restoreLastSession: Task.async(function* (aSessionString) {
+    let notifyMessage = "";
+
+    try {
+      this._restoreWindow(aSessionString);
+    } catch (e) {
+      Cu.reportError("SessionStore: " + e);
+      notifyMessage = "fail";
+    }
+
+    Services.obs.notifyObservers(null, "sessionstore-windows-restored", notifyMessage);
+  }),
+
+  removeWindow: function ss_removeWindow(aWindow) {
+    if (!aWindow || !aWindow.__SSID || !this._windows[aWindow.__SSID]) {
+      return;
+    }
+
+    delete this._windows[aWindow.__SSID];
+    delete aWindow.__SSID;
+
+    if (this._loadState == STATE_RUNNING) {
+      // Save the purged state immediately
+      this.saveState();
+    } else if (this._loadState <= STATE_QUITTING) {
+      this.saveStateDelayed();
+    }
+  }
+
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([SessionStore]);
diff --git a/mobile/android/components/SiteSpecificUserAgent.js b/mobile/android/components/SiteSpecificUserAgent.js
new file mode 100644
index 0000000000..f95d7ab163
--- /dev/null
+++ b/mobile/android/components/SiteSpecificUserAgent.js
@@ -0,0 +1,33 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Cu = Components.utils;
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/UserAgentOverrides.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+const DEFAULT_UA = Cc["@mozilla.org/network/protocol;1?name=http"]
+                     .getService(Ci.nsIHttpProtocolHandler)
+                     .userAgent;
+
+function SiteSpecificUserAgent() {}
+
+SiteSpecificUserAgent.prototype = {
+  getUserAgentForURIAndWindow: function ssua_getUserAgentForURIAndWindow(aURI, aWindow) {
+    let UA;
+    let win = Services.wm.getMostRecentWindow("navigator:browser");
+    if (win && win.DesktopUserAgent) {
+      UA = win.DesktopUserAgent.getUserAgentForWindow(aWindow);
+    }
+    return UA || UserAgentOverrides.getOverrideForURI(aURI) || DEFAULT_UA;
+  },
+
+  classID: Components.ID("{d5234c9d-0ee2-4b3c-9da3-18be9e5cf7e6}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsISiteSpecificUserAgent])
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([SiteSpecificUserAgent]);
diff --git a/mobile/android/components/Snippets.js b/mobile/android/components/Snippets.js
new file mode 100644
index 0000000000..92639236f2
--- /dev/null
+++ b/mobile/android/components/Snippets.js
@@ -0,0 +1,446 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
+
+Cu.import("resource://gre/modules/Accounts.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Home", "resource://gre/modules/Home.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "OS", "resource://gre/modules/osfile.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Task", "resource://gre/modules/Task.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "UITelemetry", "resource://gre/modules/UITelemetry.jsm");
+
+
+XPCOMUtils.defineLazyGetter(this, "gEncoder", function() { return new gChromeWin.TextEncoder(); });
+XPCOMUtils.defineLazyGetter(this, "gDecoder", function() { return new gChromeWin.TextDecoder(); });
+
+// URL to fetch snippets, in the urlFormatter service format.
+const SNIPPETS_UPDATE_URL_PREF = "browser.snippets.updateUrl";
+
+// URL to send stats data to metrics.
+const SNIPPETS_STATS_URL_PREF = "browser.snippets.statsUrl";
+
+// URL to fetch country code, a value that's cached and refreshed once per month.
+const SNIPPETS_GEO_URL_PREF = "browser.snippets.geoUrl";
+
+// Timestamp when we last updated the user's country code.
+const SNIPPETS_GEO_LAST_UPDATE_PREF = "browser.snippets.geoLastUpdate";
+
+// Pref where we'll cache the user's country.
+const SNIPPETS_COUNTRY_CODE_PREF = "browser.snippets.countryCode";
+
+// Pref where we store an array IDs of snippets that should not be shown again
+const SNIPPETS_REMOVED_IDS_PREF = "browser.snippets.removedIds";
+
+// How frequently we update the user's country code from the server (30 days).
+const SNIPPETS_GEO_UPDATE_INTERVAL_MS = 86400000*30;
+
+// Should be bumped up if the snippets content format changes.
+const SNIPPETS_VERSION = 1;
+
+XPCOMUtils.defineLazyGetter(this, "gSnippetsURL", function() {
+  let updateURL = Services.prefs.getCharPref(SNIPPETS_UPDATE_URL_PREF).replace("%SNIPPETS_VERSION%", SNIPPETS_VERSION);
+  return Services.urlFormatter.formatURL(updateURL);
+});
+
+// Where we cache snippets data
+XPCOMUtils.defineLazyGetter(this, "gSnippetsPath", function() {
+  return OS.Path.join(OS.Constants.Path.profileDir, "snippets.json");
+});
+
+XPCOMUtils.defineLazyGetter(this, "gStatsURL", function() {
+  return Services.prefs.getCharPref(SNIPPETS_STATS_URL_PREF);
+});
+
+// Where we store stats about which snippets have been shown
+XPCOMUtils.defineLazyGetter(this, "gStatsPath", function() {
+  return OS.Path.join(OS.Constants.Path.profileDir, "snippets-stats.txt");
+});
+
+XPCOMUtils.defineLazyGetter(this, "gGeoURL", function() {
+  return Services.prefs.getCharPref(SNIPPETS_GEO_URL_PREF);
+});
+
+XPCOMUtils.defineLazyGetter(this, "gCountryCode", function() {
+  try {
+    return Services.prefs.getCharPref(SNIPPETS_COUNTRY_CODE_PREF);
+  } catch (e) {
+    // Return an empty string if the country code pref isn't set yet.
+    return "";
+  }
+});
+
+XPCOMUtils.defineLazyGetter(this, "gChromeWin", function() {
+  return Services.wm.getMostRecentWindow("navigator:browser");
+});
+
+/**
+ * Updates snippet data and country code (if necessary).
+ */
+function update() {
+  // Check to see if we should update the user's country code from the geo server.
+  let lastUpdate = 0;
+  try {
+    lastUpdate = parseFloat(Services.prefs.getCharPref(SNIPPETS_GEO_LAST_UPDATE_PREF));
+  } catch (e) {}
+
+  if (Date.now() - lastUpdate > SNIPPETS_GEO_UPDATE_INTERVAL_MS) {
+    // We should update the snippets after updating the country code,
+    // so that we can filter snippets to add to the banner.
+    updateCountryCode(updateSnippets);
+  } else {
+    updateSnippets();
+  }
+}
+
+/**
+ * Fetches the user's country code from the geo server and stores the value in a pref.
+ *
+ * @param callback function called once country code is updated
+ */
+function updateCountryCode(callback) {
+  _httpGetRequest(gGeoURL, function(responseText) {
+    // Store the country code in a pref.
+    let data = JSON.parse(responseText);
+    Services.prefs.setCharPref(SNIPPETS_COUNTRY_CODE_PREF, data.country_code);
+
+    // Set last update time.
+    Services.prefs.setCharPref(SNIPPETS_GEO_LAST_UPDATE_PREF, Date.now());
+
+    callback();
+  });
+}
+
+/**
+ * Loads snippets from snippets server, caches the response, and
+ * updates the home banner with the new set of snippets.
+ */
+function updateSnippets() {
+  _httpGetRequest(gSnippetsURL, function(responseText) {
+    try {
+      let messages = JSON.parse(responseText);
+      updateBanner(messages);
+
+      // Only cache the response if it is valid JSON.
+      cacheSnippets(responseText);
+    } catch (e) {
+      Cu.reportError("Error parsing snippets responseText: " + e);
+    }
+  });
+}
+
+/**
+ * Caches snippets server response text to `snippets.json` in profile directory.
+ *
+ * @param response responseText returned from snippets server
+ */
+function cacheSnippets(response) {
+  let data = gEncoder.encode(response);
+  let promise = OS.File.writeAtomic(gSnippetsPath, data, { tmpPath: gSnippetsPath + ".tmp" });
+  promise.then(null, e => Cu.reportError("Error caching snippets: " + e));
+}
+
+/**
+ * Loads snippets from cached `snippets.json`.
+ */
+function loadSnippetsFromCache() {
+  let promise = OS.File.read(gSnippetsPath);
+  promise.then(array => {
+    let messages = JSON.parse(gDecoder.decode(array));
+    updateBanner(messages);
+  }, e => {
+    if (e instanceof OS.File.Error && e.becauseNoSuchFile) {
+      Services.console.logStringMessage("Couldn't show snippets because cache does not exist yet.");
+    } else {
+      Cu.reportError("Error loading snippets from cache: " + e);
+    }
+  });
+}
+
+// Array of the message ids added to the home banner, used to remove
+// older set of snippets when new ones are available.
+var gMessageIds = [];
+
+/**
+ * Updates set of snippets in the home banner message rotation.
+ *
+ * @param messages JSON array of message data JSON objects.
+ *   Each message object should have the following properties:
+ *     - id (?): Unique identifier for this snippets message
+ *     - text (string): Text to show as banner message
+ *     - url (string): URL to open when banner is clicked
+ *     - icon (data URI): Icon to appear in banner
+ *     - countries (list of strings): Country codes for where this message should be shown (e.g. ["US", "GR"])
+ */
+function updateBanner(messages) {
+  // Remove the current messages, if there are any.
+  gMessageIds.forEach(function(id) {
+    Home.banner.remove(id);
+  })
+  gMessageIds = [];
+
+  try {
+    let removedSnippetIds = JSON.parse(Services.prefs.getCharPref(SNIPPETS_REMOVED_IDS_PREF));
+    messages = messages.filter(function(message) {
+      // Only include the snippet if it has not been previously removed.
+      return removedSnippetIds.indexOf(message.id) === -1;
+    });
+  } catch (e) {
+    // If the pref doesn't exist, there aren't any snippets to filter out.
+  }
+
+  messages.forEach(function(message) {
+    // Don't add this message to the banner if it's not supposed to be shown in this country.
+    if ("countries" in message && message.countries.indexOf(gCountryCode) === -1) {
+      return;
+    }
+
+    let id = Home.banner.add({
+      text: message.text,
+      icon: message.icon,
+      weight: message.weight,
+      onclick: function() {
+        gChromeWin.BrowserApp.loadURI(message.url);
+        removeSnippet(id, message.id);
+        UITelemetry.addEvent("action.1", "banner", null, message.id);
+      },
+      ondismiss: function() {
+        removeSnippet(id, message.id);
+        UITelemetry.addEvent("cancel.1", "banner", null, message.id);
+      },
+      onshown: function() {
+        // 10% of the time, record the snippet id and a timestamp
+        if (Math.random() < .1) {
+          writeStat(message.id, new Date().toISOString());
+        }
+      }
+    });
+    // Keep track of the message we added so that we can remove it later.
+    gMessageIds.push(id);
+  });
+}
+
+/**
+ * Removes a snippet message from the home banner rotation, and stores its
+ * snippet id in a pref so we'll never show it again.
+ *
+ * @param messageId unique id for home banner message, returned from Home.banner API
+ * @param snippetId unique id for snippet, sent from snippets server
+ */
+function removeSnippet(messageId, snippetId) {
+  // Remove the message from the home banner rotation.
+  Home.banner.remove(messageId);
+
+  // Remove the message from the stored message ids.
+  gMessageIds.splice(gMessageIds.indexOf(messageId), 1);
+
+  let removedSnippetIds;
+  try {
+    removedSnippetIds = JSON.parse(Services.prefs.getCharPref(SNIPPETS_REMOVED_IDS_PREF));
+  } catch (e) {
+    removedSnippetIds = [];
+  }
+
+  removedSnippetIds.push(snippetId);
+  Services.prefs.setCharPref(SNIPPETS_REMOVED_IDS_PREF, JSON.stringify(removedSnippetIds));
+}
+
+/**
+ * Appends snippet id and timestamp to the end of `snippets-stats.txt`.
+ *
+ * @param snippetId unique id for snippet, sent from snippets server
+ * @param timestamp in ISO8601
+ */
+function writeStat(snippetId, timestamp) {
+  let data = gEncoder.encode(snippetId + "," + timestamp + ";");
+
+  Task.spawn(function() {
+    try {
+      let file = yield OS.File.open(gStatsPath, { append: true, write: true });
+      try {
+        yield file.write(data);
+      } finally {
+        yield file.close();
+      }
+    } catch (ex if ex instanceof OS.File.Error && ex.becauseNoSuchFile) {
+      // If the file doesn't exist yet, create it.
+      yield OS.File.writeAtomic(gStatsPath, data, { tmpPath: gStatsPath + ".tmp" });
+    }
+  }).then(null, e => Cu.reportError("Error writing snippets stats: " + e));
+}
+
+/**
+ * Reads snippets stats data from `snippets-stats.txt` and sends the data to metrics.
+ */
+function sendStats() {
+  let promise = OS.File.read(gStatsPath);
+  promise.then(array => sendStatsRequest(gDecoder.decode(array)), e => {
+    if (e instanceof OS.File.Error && e.becauseNoSuchFile) {
+      // If the file doesn't exist, there aren't any stats to send.
+    } else {
+      Cu.reportError("Error eading snippets stats: " + e);
+    }
+  });
+}
+
+/**
+ * Sends stats to metrics about which snippets have been shown.
+ * Appends snippet ids and timestamps as parameters to a GET request.
+ * e.g. https://snippets-stats.mozilla.org/mobile?s1=3825&t1=2013-11-17T18:27Z&s2=6326&t2=2013-11-18T18:27Z
+ *
+ * @param data contents of stats data file
+ */
+function sendStatsRequest(data) {
+  let params = [];
+  let stats = data.split(";");
+
+  // The last item in the array will be an empty string, so stop before then.
+  for (let i = 0; i < stats.length - 1; i++) {
+    let stat = stats[i].split(",");
+    params.push("s" + i + "=" + encodeURIComponent(stat[0]));
+    params.push("t" + i + "=" + encodeURIComponent(stat[1]));
+  }
+
+  let url = gStatsURL + "?" + params.join("&");
+
+  // Remove the file after succesfully sending the data.
+  _httpGetRequest(url, removeStats);
+}
+
+/**
+ * Removes text file where we store snippets stats.
+ */
+function removeStats() {
+  let promise = OS.File.remove(gStatsPath);
+  promise.then(null, e => Cu.reportError("Error removing snippets stats: " + e));
+}
+
+/**
+ * Helper function to make HTTP GET requests.
+ *
+ * @param url where we send the request
+ * @param callback function that is called with the xhr responseText
+ */
+function _httpGetRequest(url, callback) {
+  let xhr = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest);
+  try {
+    xhr.open("GET", url, true);
+  } catch (e) {
+    Cu.reportError("Error opening request to " + url + ": " + e);
+    return;
+  }
+  xhr.onerror = function onerror(e) {
+    Cu.reportError("Error making request to " + url + ": " + e.error);
+  }
+  xhr.onload = function onload(event) {
+    if (xhr.status !== 200) {
+      Cu.reportError("Request to " + url + " returned status " + xhr.status);
+      return;
+    }
+    if (callback) {
+      callback(xhr.responseText);
+    }
+  }
+  xhr.send(null);
+}
+
+function loadSyncPromoBanner() {
+  Accounts.anySyncAccountsExist().then(
+    (exist) => {
+      // Don't show the banner if sync accounts exist.
+      if (exist) {
+        return;
+      }
+
+      let stringBundle = Services.strings.createBundle("chrome://browser/locale/sync.properties");
+      let text = stringBundle.GetStringFromName("promoBanner.message.text");
+      let link = stringBundle.GetStringFromName("promoBanner.message.link");
+
+      let id = Home.banner.add({
+        text: text + "<a href=\"#\">" + link + "</a>",
+        icon: "drawable://sync_promo",
+        onclick: function() {
+          // Remove the message, so that it won't show again for the rest of the app lifetime.
+          Home.banner.remove(id);
+          Accounts.launchSetup();
+
+          UITelemetry.addEvent("action.1", "banner", null, "syncpromo");
+        },
+        ondismiss: function() {
+          // Remove the sync promo message from the banner and never try to show it again.
+          Home.banner.remove(id);
+          Services.prefs.setBoolPref("browser.snippets.syncPromo.enabled", false);
+
+          UITelemetry.addEvent("cancel.1", "banner", null, "syncpromo");
+        }
+      });
+    },
+    (err) => {
+      Cu.reportError("Error checking whether sync account exists: " + err);
+    }
+  );
+}
+
+function loadHomePanelsBanner() {
+  let stringBundle = Services.strings.createBundle("chrome://browser/locale/aboutHome.properties");
+  let text = stringBundle.GetStringFromName("banner.firstrunHomepage.text");
+
+  let id = Home.banner.add({
+    text: text,
+    icon: "drawable://homepage_banner_firstrun",
+    onclick: function() {
+      // Remove the message, so that it won't show again for the rest of the app lifetime.
+      Home.banner.remove(id);
+      // User has interacted with this snippet so don't show it again.
+      Services.prefs.setBoolPref("browser.snippets.firstrunHomepage.enabled", false);
+
+      UITelemetry.addEvent("action.1", "banner", null, "firstrun-homepage");
+    },
+    ondismiss: function() {
+      Home.banner.remove(id);
+      Services.prefs.setBoolPref("browser.snippets.firstrunHomepage.enabled", false);
+
+      UITelemetry.addEvent("cancel.1", "banner", null, "firstrun-homepage");
+    }
+  });
+}
+
+function Snippets() {}
+
+Snippets.prototype = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver, Ci.nsITimerCallback]),
+  classID: Components.ID("{a78d7e59-b558-4321-a3d6-dffe2f1e76dd}"),
+
+  observe: function(subject, topic, data) {
+    switch(topic) {
+      case "browser-delayed-startup-finished":
+        // Add snippets to be cycled through.
+        if (Services.prefs.getBoolPref("browser.snippets.firstrunHomepage.enabled")) {
+          loadHomePanelsBanner();
+        }
+
+        if (Services.prefs.getBoolPref("browser.snippets.syncPromo.enabled")) {
+          loadSyncPromoBanner();
+        }
+
+        if (Services.prefs.getBoolPref("browser.snippets.enabled")) {
+          loadSnippetsFromCache();
+        }
+        break;
+    }
+  },
+
+  // By default, this timer fires once every 24 hours. See the "browser.snippets.updateInterval" pref.
+  notify: function(timer) {
+    if (!Services.prefs.getBoolPref("browser.snippets.enabled")) {
+      return;
+    }
+    update();
+    sendStats();
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([Snippets]);
diff --git a/mobile/android/components/TabSource.js b/mobile/android/components/TabSource.js
new file mode 100644
index 0000000000..c35a54438a
--- /dev/null
+++ b/mobile/android/components/TabSource.js
@@ -0,0 +1,91 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict"
+
+const { classes: Cc, interfaces: Ci, manager: Cm, utils: Cu, results: Cr } = Components;
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Prompt",
+                                  "resource://gre/modules/Prompt.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Messaging",
+                                  "resource://gre/modules/Messaging.jsm");
+
+function TabSource() {
+}
+
+TabSource.prototype = {
+  classID: Components.ID("{5850c76e-b916-4218-b99a-31f004e0a7e7}"),
+  classDescription: "Fennec Tab Source",
+  contractID: "@mozilla.org/tab-source-service;1",
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsITabSource]),
+
+  getTabToStream: function() {
+    let app = Services.wm.getMostRecentWindow("navigator:browser").BrowserApp;
+    let tabs = app.tabs;
+    if (tabs == null || tabs.length == 0) {
+      Services.console.logStringMessage("ERROR: No tabs");
+      return null;
+    }
+
+    let bundle = Services.strings.createBundle("chrome://browser/locale/browser.properties");
+    let title = bundle.GetStringFromName("tabshare.title")
+
+    let prompt = new Prompt({
+      title: title,
+      window: null
+    }).setSingleChoiceItems(tabs.map(function(tab) {
+      let label;
+      if (tab.browser.contentTitle)
+        label = tab.browser.contentTitle;
+      else if (tab.browser.contentURI)
+        label = tab.browser.contentURI.spec;
+      else
+        label = tab.originalURI.spec;
+      return { label: label,
+               icon: "thumbnail:" + tab.id }
+    }));
+
+    let result = null;
+    prompt.show(function(data) {
+      result = data.button;
+    });
+
+    // Spin this thread while we wait for a result.
+    let thread = Services.tm.currentThread;
+    while (result == null) {
+      thread.processNextEvent(true);
+    }
+
+    if (result == -1) {
+      return null;
+    }
+    return tabs[result].browser.contentWindow;
+  },
+
+  notifyStreamStart: function(window) {
+    let app = Services.wm.getMostRecentWindow("navigator:browser").BrowserApp;
+    let tabs = app.tabs;
+    for (var i in tabs) {
+      if (tabs[i].browser.contentWindow == window) {
+        Messaging.sendRequest({ type: "Tab:StreamStart", tabID: tabs[i].id });
+      }
+    }
+  },
+
+  notifyStreamStop: function(window) {
+    let app = Services.wm.getMostRecentWindow("navigator:browser").BrowserApp;
+    let tabs = app.tabs;
+    for (let i in tabs) {
+      if (tabs[i].browser.contentWindow == window) {
+        Messaging.sendRequest({ type: "Tab:StreamStop", tabID: tabs[i].id });
+      }
+    }
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([TabSource]);
diff --git a/mobile/android/components/XPIDialogService.js b/mobile/android/components/XPIDialogService.js
new file mode 100644
index 0000000000..2a33d4ddff
--- /dev/null
+++ b/mobile/android/components/XPIDialogService.js
@@ -0,0 +1,49 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "AddonManager", "resource://gre/modules/AddonManager.jsm");
+
+// -----------------------------------------------------------------------
+// Web Install Prompt service
+// -----------------------------------------------------------------------
+
+function WebInstallPrompt() { }
+
+WebInstallPrompt.prototype = {
+  classID: Components.ID("{c1242012-27d8-477e-a0f1-0b098ffc329b}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.amIWebInstallPrompt]),
+
+  confirm: function(aBrowser, aURL, aInstalls) {
+    let bundle = Services.strings.createBundle("chrome://browser/locale/browser.properties");
+
+    let prompt = Services.prompt;
+    let flags = prompt.BUTTON_POS_0 * prompt.BUTTON_TITLE_IS_STRING + prompt.BUTTON_POS_1 * prompt.BUTTON_TITLE_CANCEL;
+    let title = bundle.GetStringFromName("addonsConfirmInstall.title");
+    let button = bundle.GetStringFromName("addonsConfirmInstall.install");
+
+    aInstalls.forEach(function(install) {
+      let message;
+      if (install.addon.signedState <= AddonManager.SIGNEDSTATE_MISSING) {
+        title = bundle.GetStringFromName("addonsConfirmInstallUnsigned.title")
+        message = bundle.GetStringFromName("addonsConfirmInstallUnsigned.message") + "\n\n" + install.name;
+      } else {
+        message = install.name;
+      }
+
+      let result = (prompt.confirmEx(aBrowser.contentWindow, title, message, flags, button, null, null, null, {value: false}) == 0);
+      if (result)
+        install.install();
+      else
+        install.cancel();
+    });
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([WebInstallPrompt]);
diff --git a/mobile/android/components/build/moz.build b/mobile/android/components/build/moz.build
new file mode 100644
index 0000000000..7a5c439e72
--- /dev/null
+++ b/mobile/android/components/build/moz.build
@@ -0,0 +1,31 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+XPIDL_SOURCES += [
+    'nsIShellService.idl',
+]
+
+XPIDL_MODULE = 'browsercomps'
+
+EXPORTS += [
+    'nsBrowserComponents.h',
+]
+
+SOURCES += [
+    'nsBrowserModule.cpp',
+    'nsShellService.cpp',
+]
+
+if CONFIG['MOZ_ANDROID_HISTORY']:
+    SOURCES += [
+        'nsAndroidHistory.cpp',
+    ]
+    LOCAL_INCLUDES += [
+        '/docshell/base',
+        '/dom/base',
+    ]
+
+FINAL_LIBRARY = 'xul'
diff --git a/mobile/android/components/build/nsAndroidHistory.cpp b/mobile/android/components/build/nsAndroidHistory.cpp
new file mode 100644
index 0000000000..2610781c07
--- /dev/null
+++ b/mobile/android/components/build/nsAndroidHistory.cpp
@@ -0,0 +1,395 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsThreadUtils.h"
+#include "nsAndroidHistory.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIURI.h"
+#include "nsIObserverService.h"
+#include "GeneratedJNIWrappers.h"
+#include "Link.h"
+
+#include "mozilla/Services.h"
+#include "mozilla/Preferences.h"
+
+#define NS_LINK_VISITED_EVENT_TOPIC "link-visited"
+
+// We copy Places here.
+// Note that we don't yet observe this pref at runtime.
+#define PREF_HISTORY_ENABLED "places.history.enabled"
+
+// Time we wait to see if a pending visit is really a redirect
+#define PENDING_REDIRECT_TIMEOUT 3000
+
+using namespace mozilla;
+using mozilla::dom::Link;
+
+NS_IMPL_ISUPPORTS(nsAndroidHistory, IHistory, nsIRunnable, nsITimerCallback)
+
+nsAndroidHistory* nsAndroidHistory::sHistory = nullptr;
+
+/*static*/
+nsAndroidHistory*
+nsAndroidHistory::GetSingleton()
+{
+  if (!sHistory) {
+    sHistory = new nsAndroidHistory();
+    NS_ENSURE_TRUE(sHistory, nullptr);
+  }
+
+  NS_ADDREF(sHistory);
+  return sHistory;
+}
+
+nsAndroidHistory::nsAndroidHistory()
+  : mHistoryEnabled(true)
+{
+  LoadPrefs();
+
+  mTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
+}
+
+NS_IMETHODIMP
+nsAndroidHistory::RegisterVisitedCallback(nsIURI *aURI, Link *aContent)
+{
+  if (!aContent || !aURI)
+    return NS_OK;
+
+  // Silently return if URI is something we would never add to DB.
+  bool canAdd;
+  nsresult rv = CanAddURI(aURI, &canAdd);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!canAdd) {
+    return NS_OK;
+  }
+
+  nsAutoCString uri;
+  rv = aURI->GetSpec(uri);
+  if (NS_FAILED(rv)) return rv;
+  NS_ConvertUTF8toUTF16 uriString(uri);
+
+  nsTArray<Link*>* list = mListeners.Get(uriString);
+  if (! list) {
+    list = new nsTArray<Link*>();
+    mListeners.Put(uriString, list);
+  }
+  list->AppendElement(aContent);
+
+  if (jni::IsAvailable()) {
+    java::GeckoAppShell::CheckURIVisited(uriString);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsAndroidHistory::UnregisterVisitedCallback(nsIURI *aURI, Link *aContent)
+{
+  if (!aContent || !aURI)
+    return NS_OK;
+
+  nsAutoCString uri;
+  nsresult rv = aURI->GetSpec(uri);
+  if (NS_FAILED(rv)) return rv;
+  NS_ConvertUTF8toUTF16 uriString(uri);
+
+  nsTArray<Link*>* list = mListeners.Get(uriString);
+  if (! list)
+    return NS_OK;
+
+  list->RemoveElement(aContent);
+  if (list->IsEmpty()) {
+    mListeners.Remove(uriString);
+    delete list;
+  }
+  return NS_OK;
+}
+
+void
+nsAndroidHistory::AppendToRecentlyVisitedURIs(nsIURI* aURI) {
+  if (mRecentlyVisitedURIs.Length() < RECENTLY_VISITED_URI_SIZE) {
+    // Append a new element while the array is not full.
+    mRecentlyVisitedURIs.AppendElement(aURI);
+  } else {
+    // Otherwise, replace the oldest member.
+    mRecentlyVisitedURIsNextIndex %= RECENTLY_VISITED_URI_SIZE;
+    mRecentlyVisitedURIs.ElementAt(mRecentlyVisitedURIsNextIndex) = aURI;
+    mRecentlyVisitedURIsNextIndex++;
+  }
+}
+
+bool
+nsAndroidHistory::ShouldRecordHistory() {
+  return mHistoryEnabled;
+}
+
+void
+nsAndroidHistory::LoadPrefs() {
+  mHistoryEnabled = Preferences::GetBool(PREF_HISTORY_ENABLED, true);
+}
+
+inline bool
+nsAndroidHistory::IsRecentlyVisitedURI(nsIURI* aURI) {
+  bool equals = false;
+  RecentlyVisitedArray::index_type i;
+  RecentlyVisitedArray::size_type length = mRecentlyVisitedURIs.Length();
+  for (i = 0; i < length && !equals; ++i) {
+    aURI->Equals(mRecentlyVisitedURIs.ElementAt(i), &equals);
+  }
+  return equals;
+}
+
+void
+nsAndroidHistory::AppendToEmbedURIs(nsIURI* aURI) {
+  if (mEmbedURIs.Length() < EMBED_URI_SIZE) {
+    // Append a new element while the array is not full.
+    mEmbedURIs.AppendElement(aURI);
+  } else {
+    // Otherwise, replace the oldest member.
+    mEmbedURIsNextIndex %= EMBED_URI_SIZE;
+    mEmbedURIs.ElementAt(mEmbedURIsNextIndex) = aURI;
+    mEmbedURIsNextIndex++;
+  }
+}
+
+inline bool
+nsAndroidHistory::IsEmbedURI(nsIURI* aURI) {
+  bool equals = false;
+  EmbedArray::index_type i;
+  EmbedArray::size_type length = mEmbedURIs.Length();
+  for (i = 0; i < length && !equals; ++i) {
+    aURI->Equals(mEmbedURIs.ElementAt(i), &equals);
+  }
+  return equals;
+}
+
+inline bool
+nsAndroidHistory::RemovePendingVisitURI(nsIURI* aURI) {
+  // Remove the first pending URI that matches. Return a boolean to
+  // let the caller know if we removed a URI or not.
+  bool equals = false;
+  PendingVisitArray::index_type i;
+  for (i = 0; i < mPendingVisitURIs.Length(); ++i) {
+    aURI->Equals(mPendingVisitURIs.ElementAt(i), &equals);
+    if (equals) {
+      mPendingVisitURIs.RemoveElementAt(i);
+      return true;
+    }
+  }
+  return false;
+}
+
+NS_IMETHODIMP
+nsAndroidHistory::Notify(nsITimer *timer)
+{
+  // Any pending visits left in the queue have exceeded our threshold for
+  // redirects, so save them
+  PendingVisitArray::index_type i;
+  for (i = 0; i < mPendingVisitURIs.Length(); ++i) {
+    SaveVisitURI(mPendingVisitURIs.ElementAt(i));
+  }
+  mPendingVisitURIs.Clear();
+
+  return NS_OK;
+}
+
+void
+nsAndroidHistory::SaveVisitURI(nsIURI* aURI) {
+  // Add the URI to our cache so we can take a fast path later
+  AppendToRecentlyVisitedURIs(aURI);
+
+  if (jni::IsAvailable()) {
+    // Save this URI in our history
+    nsAutoCString spec;
+    (void)aURI->GetSpec(spec);
+    java::GeckoAppShell::MarkURIVisited(NS_ConvertUTF8toUTF16(spec));
+  }
+
+  // Finally, notify that we've been visited.
+  nsCOMPtr<nsIObserverService> obsService = mozilla::services::GetObserverService();
+  if (obsService) {
+    obsService->NotifyObservers(aURI, NS_LINK_VISITED_EVENT_TOPIC, nullptr);
+  }
+}
+
+NS_IMETHODIMP
+nsAndroidHistory::VisitURI(nsIURI *aURI, nsIURI *aLastVisitedURI, uint32_t aFlags)
+{
+  if (!aURI) {
+    return NS_OK;
+  }
+
+  if (!(aFlags & VisitFlags::TOP_LEVEL)) {
+    return NS_OK;
+  }
+
+  if (aFlags & VisitFlags::UNRECOVERABLE_ERROR) {
+    return NS_OK;
+  }
+
+  // Silently return if URI is something we shouldn't add to DB.
+  bool canAdd;
+  nsresult rv = CanAddURI(aURI, &canAdd);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!canAdd) {
+    return NS_OK;
+  }
+
+  if (aLastVisitedURI) {
+    if (aFlags & VisitFlags::REDIRECT_SOURCE ||
+        aFlags & VisitFlags::REDIRECT_PERMANENT ||
+        aFlags & VisitFlags::REDIRECT_TEMPORARY) {
+      // aLastVisitedURI redirected to aURI. We want to ignore aLastVisitedURI,
+      // so remove the pending visit. We want to give aURI a chance to be saved,
+      // so don't return early.
+      RemovePendingVisitURI(aLastVisitedURI);
+    }
+
+    bool same;
+    rv = aURI->Equals(aLastVisitedURI, &same);
+    NS_ENSURE_SUCCESS(rv, rv);
+    if (same && IsRecentlyVisitedURI(aURI)) {
+      // Do not save refresh visits if we have visited this URI recently.
+      return NS_OK;
+    }
+
+    // Since we have a last visited URI and we were not redirected, it is
+    // safe to save the visit if it's still pending.
+    if (RemovePendingVisitURI(aLastVisitedURI)) {
+      SaveVisitURI(aLastVisitedURI);
+    }
+  }
+
+  // Let's wait and see if this visit is not a redirect.
+  mPendingVisitURIs.AppendElement(aURI);
+  mTimer->InitWithCallback(this, PENDING_REDIRECT_TIMEOUT, nsITimer::TYPE_ONE_SHOT);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsAndroidHistory::SetURITitle(nsIURI *aURI, const nsAString& aTitle)
+{
+  // Silently return if URI is something we shouldn't add to DB.
+  bool canAdd;
+  nsresult rv = CanAddURI(aURI, &canAdd);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!canAdd) {
+    return NS_OK;
+  }
+
+  if (IsEmbedURI(aURI)) {
+    return NS_OK;
+  }
+
+  if (jni::IsAvailable()) {
+    nsAutoCString uri;
+    nsresult rv = aURI->GetSpec(uri);
+    if (NS_FAILED(rv)) return rv;
+    if (RemovePendingVisitURI(aURI)) {
+      // We have a title, so aURI isn't a redirect, so save the visit now before setting the title.
+      SaveVisitURI(aURI);
+    }
+    NS_ConvertUTF8toUTF16 uriString(uri);
+    java::GeckoAppShell::SetURITitle(uriString, aTitle);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsAndroidHistory::NotifyVisited(nsIURI *aURI)
+{
+  if (aURI && sHistory) {
+    nsAutoCString spec;
+    (void)aURI->GetSpec(spec);
+    sHistory->mPendingLinkURIs.Push(NS_ConvertUTF8toUTF16(spec));
+    NS_DispatchToMainThread(sHistory);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsAndroidHistory::Run()
+{
+  while (! mPendingLinkURIs.IsEmpty()) {
+    nsString uriString = mPendingLinkURIs.Pop();
+    nsTArray<Link*>* list = sHistory->mListeners.Get(uriString);
+    if (list) {
+      for (unsigned int i = 0; i < list->Length(); i++) {
+        list->ElementAt(i)->SetLinkState(eLinkState_Visited);
+      }
+      // as per the IHistory interface contract, remove the
+      // Link pointers once they have been notified
+      mListeners.Remove(uriString);
+      delete list;
+    }
+  }
+  return NS_OK;
+}
+
+// Filter out unwanted URIs such as "chrome:", "mailbox:", etc.
+//
+// The model is if we don't know differently then add which basically means
+// we are suppose to try all the things we know not to allow in and then if
+// we don't bail go on and allow it in.
+//
+// Logic ported from nsNavHistory::CanAddURI.
+
+NS_IMETHODIMP
+nsAndroidHistory::CanAddURI(nsIURI* aURI, bool* canAdd)
+{
+  NS_ASSERTION(NS_IsMainThread(), "This can only be called on the main thread");
+  NS_ENSURE_ARG(aURI);
+  NS_ENSURE_ARG_POINTER(canAdd);
+
+  // See if we're disabled.
+  if (!ShouldRecordHistory()) {
+    *canAdd = false;
+    return NS_OK;
+  }
+
+  nsAutoCString scheme;
+  nsresult rv = aURI->GetScheme(scheme);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // first check the most common cases (HTTP, HTTPS) to allow in to avoid most
+  // of the work
+  if (scheme.EqualsLiteral("http")) {
+    *canAdd = true;
+    return NS_OK;
+  }
+  if (scheme.EqualsLiteral("https")) {
+    *canAdd = true;
+    return NS_OK;
+  }
+  if (scheme.EqualsLiteral("about")) {
+    nsAutoCString path;
+    rv = aURI->GetPath(path);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (StringBeginsWith(path, NS_LITERAL_CSTRING("reader"))) {
+      *canAdd = true;
+      return NS_OK;
+    }
+  }
+
+  // now check for all bad things
+  if (scheme.EqualsLiteral("about") ||
+      scheme.EqualsLiteral("imap") ||
+      scheme.EqualsLiteral("news") ||
+      scheme.EqualsLiteral("mailbox") ||
+      scheme.EqualsLiteral("moz-anno") ||
+      scheme.EqualsLiteral("view-source") ||
+      scheme.EqualsLiteral("chrome") ||
+      scheme.EqualsLiteral("resource") ||
+      scheme.EqualsLiteral("data") ||
+      scheme.EqualsLiteral("wyciwyg") ||
+      scheme.EqualsLiteral("javascript") ||
+      scheme.EqualsLiteral("blob")) {
+    *canAdd = false;
+    return NS_OK;
+  }
+  *canAdd = true;
+  return NS_OK;
+}
diff --git a/mobile/android/components/build/nsAndroidHistory.h b/mobile/android/components/build/nsAndroidHistory.h
new file mode 100644
index 0000000000..382fbcd2ec
--- /dev/null
+++ b/mobile/android/components/build/nsAndroidHistory.h
@@ -0,0 +1,97 @@
+/* -*- Mode: c++; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef NS_ANDROIDHISTORY_H
+#define NS_ANDROIDHISTORY_H
+
+#include "IHistory.h"
+#include "nsDataHashtable.h"
+#include "nsTPriorityQueue.h"
+#include "nsIRunnable.h"
+#include "nsIURI.h"
+#include "nsITimer.h"
+
+
+#define NS_ANDROIDHISTORY_CID \
+    {0xCCAA4880, 0x44DD, 0x40A7, {0xA1, 0x3F, 0x61, 0x56, 0xFC, 0x88, 0x2C, 0x0B}}
+
+// Max size of History::mRecentlyVisitedURIs
+#define RECENTLY_VISITED_URI_SIZE 8
+
+// Max size of History::mEmbedURIs
+#define EMBED_URI_SIZE 128
+
+class nsAndroidHistory final : public mozilla::IHistory,
+                               public nsIRunnable,
+                               public nsITimerCallback
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_IHISTORY
+  NS_DECL_NSIRUNNABLE
+  NS_DECL_NSITIMERCALLBACK
+
+  /**
+   * Obtains a pointer that has had AddRef called on it.  Used by the service
+   * manager only.
+   */
+  static nsAndroidHistory* GetSingleton();
+
+  nsAndroidHistory();
+
+private:
+  ~nsAndroidHistory() {}
+
+  static nsAndroidHistory* sHistory;
+
+  // Will mimic the value of the places.history.enabled preference.
+  bool mHistoryEnabled;
+
+  void LoadPrefs();
+  bool ShouldRecordHistory();
+  nsresult CanAddURI(nsIURI* aURI, bool* canAdd);
+
+  /**
+   * We need to manage data used to determine a:visited status.
+   */
+  nsDataHashtable<nsStringHashKey, nsTArray<mozilla::dom::Link *> *> mListeners;
+  nsTPriorityQueue<nsString> mPendingLinkURIs;
+
+  /**
+   * Redirection (temporary and permanent) flags are sent with the redirected
+   * URI, not the original URI. Since we want to ignore the original URI, we
+   * need to cache the pending visit and make sure it doesn't redirect.
+   */
+  RefPtr<nsITimer> mTimer;
+  typedef AutoTArray<nsCOMPtr<nsIURI>, RECENTLY_VISITED_URI_SIZE> PendingVisitArray;
+  PendingVisitArray mPendingVisitURIs;
+
+  bool RemovePendingVisitURI(nsIURI* aURI);
+  void SaveVisitURI(nsIURI* aURI);
+
+  /**
+   * mRecentlyVisitedURIs remembers URIs which are recently added to the DB,
+   * to avoid saving these locations repeatedly in a short period.
+   */
+  typedef AutoTArray<nsCOMPtr<nsIURI>, RECENTLY_VISITED_URI_SIZE> RecentlyVisitedArray;
+  RecentlyVisitedArray mRecentlyVisitedURIs;
+  RecentlyVisitedArray::index_type mRecentlyVisitedURIsNextIndex;
+
+  void AppendToRecentlyVisitedURIs(nsIURI* aURI);
+  bool IsRecentlyVisitedURI(nsIURI* aURI);
+
+  /**
+   * mEmbedURIs remembers URIs which are explicitly not added to the DB,
+   * to avoid wasting time on these locations.
+   */
+  typedef AutoTArray<nsCOMPtr<nsIURI>, EMBED_URI_SIZE> EmbedArray;
+  EmbedArray::index_type mEmbedURIsNextIndex;
+  EmbedArray mEmbedURIs;
+
+  void AppendToEmbedURIs(nsIURI* aURI);
+  bool IsEmbedURI(nsIURI* aURI);
+};
+
+#endif
diff --git a/mobile/android/components/build/nsBrowserComponents.h b/mobile/android/components/build/nsBrowserComponents.h
new file mode 100644
index 0000000000..c9830d9c5d
--- /dev/null
+++ b/mobile/android/components/build/nsBrowserComponents.h
@@ -0,0 +1,7 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Needed for building our components as part of libxul
+#define APP_COMPONENT_MODULES MODULE(nsBrowserCompsModule)
diff --git a/mobile/android/components/build/nsBrowserModule.cpp b/mobile/android/components/build/nsBrowserModule.cpp
new file mode 100644
index 0000000000..6f9fe67bf1
--- /dev/null
+++ b/mobile/android/components/build/nsBrowserModule.cpp
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ModuleUtils.h"
+
+#include "nsShellService.h"
+
+#ifdef MOZ_ANDROID_HISTORY
+#include "nsDocShellCID.h"
+#include "nsAndroidHistory.h"
+#define NS_ANDROIDHISTORY_CID \
+  {0xCCAA4880, 0x44DD, 0x40A7, {0xA1, 0x3F, 0x61, 0x56, 0xFC, 0x88, 0x2C, 0x0B}}
+#endif
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsShellService)
+NS_DEFINE_NAMED_CID(nsShellService_CID);
+
+#ifdef MOZ_ANDROID_HISTORY
+NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(nsAndroidHistory, nsAndroidHistory::GetSingleton)
+NS_DEFINE_NAMED_CID(NS_ANDROIDHISTORY_CID);
+#endif
+
+static const mozilla::Module::CIDEntry kBrowserCIDs[] = {
+  { &knsShellService_CID, false, nullptr, nsShellServiceConstructor },
+#ifdef MOZ_ANDROID_HISTORY
+  { &kNS_ANDROIDHISTORY_CID, false, nullptr, nsAndroidHistoryConstructor },
+#endif
+  { nullptr }
+};
+
+static const mozilla::Module::ContractIDEntry kBrowserContracts[] = {
+  { nsShellService_ContractID, &knsShellService_CID },
+#ifdef MOZ_ANDROID_HISTORY
+  { NS_IHISTORY_CONTRACTID, &kNS_ANDROIDHISTORY_CID },
+#endif
+  { nullptr }
+};
+
+static const mozilla::Module kBrowserModule = {
+  mozilla::Module::kVersion,
+  kBrowserCIDs,
+  kBrowserContracts
+};
+
+NSMODULE_DEFN(nsBrowserCompsModule) = &kBrowserModule;
diff --git a/mobile/android/components/build/nsIShellService.idl b/mobile/android/components/build/nsIShellService.idl
new file mode 100644
index 0000000000..e7f8d92776
--- /dev/null
+++ b/mobile/android/components/build/nsIShellService.idl
@@ -0,0 +1,26 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(fd2450a3-966b-44a9-a8eb-316256bb80b4)]
+interface nsIShellService : nsISupports
+{
+  /**
+   * This method displays a UI to switch to (or launch) a different task
+   */
+  void switchTask();
+
+  /**
+   * This method creates a shortcut on a desktop or homescreen that opens in
+   * the our application.
+   *
+   * @param aTitle     the user-friendly name of the shortcut.
+   * @param aURI       the URI to open.
+   * @param aIconData  obsolete and ignored, but remains for backward compatibility; pass an empty string
+   * @param aIntent    obsolete and ignored, but remains for backward compatibility; pass an empty string
+   */
+  void createShortcut(in AString aTitle, in AString aURI, in AString aIconData, in AString aIntent);
+};
diff --git a/mobile/android/components/build/nsShellService.cpp b/mobile/android/components/build/nsShellService.cpp
new file mode 100644
index 0000000000..86cac86b44
--- /dev/null
+++ b/mobile/android/components/build/nsShellService.cpp
@@ -0,0 +1,30 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsShellService.h"
+#include "nsString.h"
+
+#include "GeneratedJNIWrappers.h"
+
+using namespace mozilla;
+
+NS_IMPL_ISUPPORTS(nsShellService, nsIShellService)
+
+NS_IMETHODIMP
+nsShellService::SwitchTask()
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsShellService::CreateShortcut(const nsAString& aTitle, const nsAString& aURI,
+                                const nsAString& aIcondata, const nsAString& aIntent)
+{
+  if (!aTitle.Length() || !aURI.Length())
+    return NS_ERROR_FAILURE;
+
+  java::GeckoAppShell::CreateShortcut(aTitle, aURI);
+  return NS_OK;
+}
diff --git a/mobile/android/components/build/nsShellService.h b/mobile/android/components/build/nsShellService.h
new file mode 100644
index 0000000000..ba56cbcaec
--- /dev/null
+++ b/mobile/android/components/build/nsShellService.h
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __NS_SHELLSERVICE_H__
+#define __NS_SHELLSERVICE_H__
+
+#include "nsIShellService.h"
+
+class nsShellService final : public nsIShellService
+{
+public:
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISHELLSERVICE
+
+  nsShellService() {}
+
+private:
+  ~nsShellService() {}
+};
+
+#define nsShellService_CID                          \
+{0xae9ebe1c, 0x61e9, 0x45fa, {0x8f, 0x34, 0xc1, 0x07, 0x80, 0x3a, 0x5b, 0x44}}
+
+#define nsShellService_ContractID "@mozilla.org/browser/shell-service;1"
+
+#endif
diff --git a/mobile/android/components/extensions/.eslintrc.js b/mobile/android/components/extensions/.eslintrc.js
new file mode 100644
index 0000000000..4b67e27b88
--- /dev/null
+++ b/mobile/android/components/extensions/.eslintrc.js
@@ -0,0 +1,5 @@
+"use strict";
+
+module.exports = {
+  "extends": "../../../../toolkit/components/extensions/.eslintrc.js",
+};
diff --git a/mobile/android/components/extensions/ext-pageAction.js b/mobile/android/components/extensions/ext-pageAction.js
new file mode 100644
index 0000000000..fb1c3a3f37
--- /dev/null
+++ b/mobile/android/components/extensions/ext-pageAction.js
@@ -0,0 +1,169 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+XPCOMUtils.defineLazyModuleGetter(this, "EventEmitter",
+                                  "resource://devtools/shared/event-emitter.js");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Services",
+                                  "resource://gre/modules/Services.jsm");
+
+// Import the android PageActions module.
+XPCOMUtils.defineLazyModuleGetter(this, "PageActions",
+                                  "resource://gre/modules/PageActions.jsm");
+
+Cu.import("resource://gre/modules/ExtensionUtils.jsm");
+
+var {
+  IconDetails,
+  SingletonEventManager,
+} = ExtensionUtils;
+
+// WeakMap[Extension -> PageAction]
+var pageActionMap = new WeakMap();
+
+function PageAction(options, extension) {
+  this.id = null;
+
+  this.extension = extension;
+  this.icons = IconDetails.normalize({path: options.default_icon}, extension);
+
+  this.popupUrl = options.default_popup;
+
+  this.options = {
+    title: options.default_title || extension.name,
+    id: `{${extension.uuid}}`,
+    clickCallback: () => {
+      if (this.popupUrl) {
+        let win = Services.wm.getMostRecentWindow("navigator:browser");
+        win.BrowserApp.addTab(this.popupUrl, {
+          selected: true,
+          parentId: win.BrowserApp.selectedTab.id,
+        });
+      } else {
+        this.emit("click");
+      }
+    },
+  };
+
+  this.shouldShow = false;
+
+  EventEmitter.decorate(this);
+}
+
+PageAction.prototype = {
+  show(tabId, context) {
+    if (this.id) {
+      return Promise.resolve();
+    }
+
+    if (this.options.icon) {
+      this.id = PageActions.add(this.options);
+      return Promise.resolve();
+    }
+
+    this.shouldShow = true;
+
+    // TODO(robwu): Remove dependency on contentWindow from this file. It should
+    // be put in a separate file called ext-c-pageAction.js.
+    // Note: Fennec is not going to be multi-process for the foreseaable future,
+    // so this layering violation has no immediate impact. However, it is should
+    // be done at some point.
+    let {contentWindow} = context.xulBrowser;
+
+    // TODO(robwu): Why is this contentWindow.devicePixelRatio, while
+    // convertImageURLToDataURL uses browserWindow.devicePixelRatio?
+    let {icon} = IconDetails.getPreferredIcon(this.icons, this.extension,
+                                              18 * contentWindow.devicePixelRatio);
+
+    let browserWindow = Services.wm.getMostRecentWindow("navigator:browser");
+    return IconDetails.convertImageURLToDataURL(icon, contentWindow, browserWindow).then(dataURI => {
+      if (this.shouldShow) {
+        this.options.icon = dataURI;
+        this.id = PageActions.add(this.options);
+      }
+    }).catch(() => {
+      return Promise.reject({
+        message: "Failed to load PageAction icon",
+      });
+    });
+  },
+
+  hide(tabId) {
+    this.shouldShow = false;
+    if (this.id) {
+      PageActions.remove(this.id);
+      this.id = null;
+    }
+  },
+
+  setPopup(tab, url) {
+    // TODO: Only set the popup for the specified tab once we have Tabs API support.
+    this.popupUrl = url;
+  },
+
+  getPopup(tab) {
+    // TODO: Only return the popup for the specified tab once we have Tabs API support.
+    return this.popupUrl;
+  },
+
+  shutdown() {
+    this.hide();
+  },
+};
+
+/* eslint-disable mozilla/balanced-listeners */
+extensions.on("manifest_page_action", (type, directive, extension, manifest) => {
+  let pageAction = new PageAction(manifest.page_action, extension);
+  pageActionMap.set(extension, pageAction);
+});
+
+extensions.on("shutdown", (type, extension) => {
+  if (pageActionMap.has(extension)) {
+    pageActionMap.get(extension).shutdown();
+    pageActionMap.delete(extension);
+  }
+});
+/* eslint-enable mozilla/balanced-listeners */
+
+extensions.registerSchemaAPI("pageAction", "addon_parent", context => {
+  let {extension} = context;
+  return {
+    pageAction: {
+      onClicked: new SingletonEventManager(context, "pageAction.onClicked", fire => {
+        let listener = (event) => {
+          fire();
+        };
+        pageActionMap.get(extension).on("click", listener);
+        return () => {
+          pageActionMap.get(extension).off("click", listener);
+        };
+      }).api(),
+
+      show(tabId) {
+        return pageActionMap.get(extension)
+                            .show(tabId, context)
+                            .then(() => {});
+      },
+
+      hide(tabId) {
+        pageActionMap.get(extension).hide(tabId);
+        return Promise.resolve();
+      },
+
+      setPopup(details) {
+        // TODO: Use the Tabs API to get the tab from details.tabId.
+        let tab = null;
+        let url = details.popup && context.uri.resolve(details.popup);
+        pageActionMap.get(extension).setPopup(tab, url);
+      },
+
+      getPopup(details) {
+        // TODO: Use the Tabs API to get the tab from details.tabId.
+        let tab = null;
+        let popup = pageActionMap.get(extension).getPopup(tab);
+        return Promise.resolve(popup);
+      },
+    },
+  };
+});
diff --git a/mobile/android/components/extensions/extensions-mobile.manifest b/mobile/android/components/extensions/extensions-mobile.manifest
new file mode 100644
index 0000000000..f15540d628
--- /dev/null
+++ b/mobile/android/components/extensions/extensions-mobile.manifest
@@ -0,0 +1,5 @@
+# scripts
+category webextension-scripts pageAction chrome://browser/content/ext-pageAction.js
+
+# schemas
+category webextension-schemas page_action chrome://browser/content/schemas/page_action.json
\ No newline at end of file
diff --git a/mobile/android/components/extensions/jar.mn b/mobile/android/components/extensions/jar.mn
new file mode 100644
index 0000000000..a3d2b8de8a
--- /dev/null
+++ b/mobile/android/components/extensions/jar.mn
@@ -0,0 +1,6 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+chrome.jar:
+    content/ext-pageAction.js
\ No newline at end of file
diff --git a/mobile/android/components/extensions/moz.build b/mobile/android/components/extensions/moz.build
new file mode 100644
index 0000000000..0953fcefc7
--- /dev/null
+++ b/mobile/android/components/extensions/moz.build
@@ -0,0 +1,16 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+JAR_MANIFESTS += ['jar.mn']
+
+EXTRA_COMPONENTS += [
+    'extensions-mobile.manifest',
+]
+
+DIRS += ['schemas']
+
+MOCHITEST_MANIFESTS += ['test/mochitest/mochitest.ini']
+MOCHITEST_CHROME_MANIFESTS += ['test/mochitest/chrome.ini']
diff --git a/mobile/android/components/extensions/schemas/jar.mn b/mobile/android/components/extensions/schemas/jar.mn
new file mode 100644
index 0000000000..1a587ce207
--- /dev/null
+++ b/mobile/android/components/extensions/schemas/jar.mn
@@ -0,0 +1,6 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+chrome.jar:
+    content/schemas/page_action.json
\ No newline at end of file
diff --git a/mobile/android/components/extensions/schemas/moz.build b/mobile/android/components/extensions/schemas/moz.build
new file mode 100644
index 0000000000..eb4454d28f
--- /dev/null
+++ b/mobile/android/components/extensions/schemas/moz.build
@@ -0,0 +1,7 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+JAR_MANIFESTS += ['jar.mn']
\ No newline at end of file
diff --git a/mobile/android/components/extensions/schemas/page_action.json b/mobile/android/components/extensions/schemas/page_action.json
new file mode 100644
index 0000000000..5e92809229
--- /dev/null
+++ b/mobile/android/components/extensions/schemas/page_action.json
@@ -0,0 +1,239 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+[
+  {
+    "namespace": "manifest",
+    "types": [
+      {
+        "$extend": "WebExtensionManifest",
+        "properties": {
+          "page_action": {
+            "type": "object",
+            "additionalProperties": { "$ref": "UnrecognizedProperty" },
+            "properties": {
+              "default_title": {
+                "type": "string",
+                "optional": true,
+                "preprocess": "localize"
+              },
+              "default_icon": {
+                "$ref": "IconPath",
+                "optional": true
+              },
+              "default_popup": {
+                "type": "string",
+                "format": "relativeUrl",
+                "optional": true,
+                "preprocess": "localize"
+              },
+              "browser_style": {
+                "type": "boolean",
+                "optional": true
+              }
+            },
+            "optional": true
+          }
+        }
+      }
+    ]
+  },
+  {
+    "namespace": "pageAction",
+    "description": "Use the <code>browser.pageAction</code> API to put icons inside the address bar. Page actions represent actions that can be taken on the current page, but that aren't applicable to all pages.",
+    "permissions": ["manifest:page_action"],
+    "types": [
+      {
+        "id": "ImageDataType",
+        "type": "object",
+        "isInstanceOf": "ImageData",
+        "additionalProperties": { "type": "any" },
+        "description": "Pixel data for an image. Must be an ImageData object (for example, from a <code>canvas</code> element)."
+      }
+    ],
+    "functions": [
+      {
+        "name": "show",
+        "type": "function",
+        "description": "Shows the page action. The page action is shown whenever the tab is selected.",
+        "async": "callback",
+        "parameters": [
+          {"type": "integer", "name": "tabId", "minimum": 0, "description": "The id of the tab for which you want to modify the page action."},
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "parameters": []
+          }
+        ]
+      },
+      {
+        "name": "hide",
+        "type": "function",
+        "description": "Hides the page action.",
+        "async": "callback",
+        "parameters": [
+          {"type": "integer", "name": "tabId", "minimum": 0, "description": "The id of the tab for which you want to modify the page action."},
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "parameters": []
+          }
+        ]
+      },
+      {
+        "name": "setTitle",
+        "unsupported": true,
+        "type": "function",
+        "description": "Sets the title of the page action. This is displayed in a tooltip over the page action.",
+        "parameters": [
+          {
+            "name": "details",
+            "type": "object",
+            "properties": {
+              "tabId": {"type": "integer", "minimum": 0, "description": "The id of the tab for which you want to modify the page action."},
+              "title": {"type": "string", "description": "The tooltip string."}
+            }
+          }
+        ]
+      },
+      {
+        "name": "getTitle",
+        "unsupported": true,
+        "type": "function",
+        "description": "Gets the title of the page action.",
+        "async": "callback",
+        "parameters": [
+          {
+            "name": "details",
+            "type": "object",
+            "properties": {
+              "tabId": {
+                "type": "integer",
+                "description": "Specify the tab to get the title from."
+              }
+            }
+          },
+          {
+            "type": "function",
+            "name": "callback",
+            "parameters": [
+              {
+                "name": "result",
+                "type": "string"
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "name": "setIcon",
+        "unsupported": true,
+        "type": "function",
+        "description": "Sets the icon for the page action. The icon can be specified either as the path to an image file or as the pixel data from a canvas element, or as dictionary of either one of those. Either the <b>path</b> or the <b>imageData</b> property must be specified.",
+        "async": "callback",
+        "parameters": [
+          {
+            "name": "details",
+            "type": "object",
+            "properties": {
+              "tabId": {"type": "integer", "minimum": 0, "description": "The id of the tab for which you want to modify the page action."},
+              "imageData": {
+                "choices": [
+                  { "$ref": "ImageDataType" },
+                  {
+                    "type": "object",
+                    "additionalProperties": {"$ref": "ImageDataType"}
+                  }
+                ],
+                "optional": true,
+                "description": "Either an ImageData object or a dictionary {size -> ImageData} representing icon to be set. If the icon is specified as a dictionary, the actual image to be used is chosen depending on screen's pixel density. If the number of image pixels that fit into one screen space unit equals <code>scale</code>, then image with size <code>scale</code> * 19 will be selected. Initially only scales 1 and 2 will be supported. At least one image must be specified. Note that 'details.imageData = foo' is equivalent to 'details.imageData = {'19': foo}'"
+              },
+              "path": {
+                "choices": [
+                  { "type": "string" },
+                  {
+                    "type": "object",
+                    "additionalProperties": {"type": "string"}
+                  }
+                ],
+                "optional": true,
+                "description": "Either a relative image path or a dictionary {size -> relative image path} pointing to icon to be set. If the icon is specified as a dictionary, the actual image to be used is chosen depending on screen's pixel density. If the number of image pixels that fit into one screen space unit equals <code>scale</code>, then image with size <code>scale</code> * 19 will be selected. Initially only scales 1 and 2 will be supported. At least one image must be specified. Note that 'details.path = foo' is equivalent to 'details.imageData = {'19': foo}'"
+              }
+            }
+          },
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "parameters": []
+          }
+        ]
+      },
+      {
+        "name": "setPopup",
+        "type": "function",
+        "async": "callback",
+        "description": "Sets the html document to be opened as a popup when the user clicks on the page action's icon.",
+        "parameters": [
+          {
+            "name": "details",
+            "type": "object",
+            "properties": {
+              "tabId": {"type": "integer", "minimum": 0, "description": "The id of the tab for which you want to modify the page action."},
+              "popup": {
+                "type": "string",
+                "description": "The html file to show in a popup.  If set to the empty string (''), no popup is shown."
+              }
+            }
+          },
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "parameters": []
+          }
+        ]
+      },
+      {
+        "name": "getPopup",
+        "type": "function",
+        "description": "Gets the html document set as the popup for this page action.",
+        "async": "callback",
+        "parameters": [
+          {
+            "name": "details",
+            "type": "object",
+            "properties": {
+              "tabId": {
+                "type": "integer",
+                "description": "Specify the tab to get the popup from."
+              }
+            }
+          },
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "parameters": []
+          }
+        ]
+      }
+    ],
+    "events": [
+      {
+        "name": "onClicked",
+        "type": "function",
+        "description": "Fired when a page action icon is clicked.  This event will not fire if the page action has a popup.",
+        "parameters": [
+          {
+            "name": "tab",
+            "$ref": "tabs.Tab"
+          }
+        ]
+      }
+    ]
+  }
+]
diff --git a/mobile/android/components/extensions/test/mochitest/.eslintrc.js b/mobile/android/components/extensions/test/mochitest/.eslintrc.js
new file mode 100644
index 0000000000..5f9059e18e
--- /dev/null
+++ b/mobile/android/components/extensions/test/mochitest/.eslintrc.js
@@ -0,0 +1,10 @@
+"use strict";
+
+module.exports = {
+  "extends": "../../../../../../toolkit/components/extensions/test/mochitest/.eslintrc.js",
+
+  "globals": {
+    "isPageActionShown": true,
+    "clickPageAction": true,
+  },
+};
diff --git a/mobile/android/components/extensions/test/mochitest/chrome.ini b/mobile/android/components/extensions/test/mochitest/chrome.ini
new file mode 100644
index 0000000000..e19ddf3933
--- /dev/null
+++ b/mobile/android/components/extensions/test/mochitest/chrome.ini
@@ -0,0 +1,7 @@
+[DEFAULT]
+support-files =
+  head.js
+tags = webextensions
+
+[test_ext_pageAction.html]
+[test_ext_pageAction_popup.html]
diff --git a/mobile/android/components/extensions/test/mochitest/head.js b/mobile/android/components/extensions/test/mochitest/head.js
new file mode 100644
index 0000000000..be9683682f
--- /dev/null
+++ b/mobile/android/components/extensions/test/mochitest/head.js
@@ -0,0 +1,15 @@
+"use strict";
+
+/* exported isPageActionShown clickPageAction */
+
+const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
+
+Cu.import("resource://gre/modules/PageActions.jsm");
+
+function isPageActionShown(uuid) {
+  return PageActions.isShown(uuid);
+}
+
+function clickPageAction(uuid) {
+  PageActions.synthesizeClick(uuid);
+}
diff --git a/mobile/android/components/extensions/test/mochitest/mochitest.ini b/mobile/android/components/extensions/test/mochitest/mochitest.ini
new file mode 100644
index 0000000000..59ef4bd20a
--- /dev/null
+++ b/mobile/android/components/extensions/test/mochitest/mochitest.ini
@@ -0,0 +1,6 @@
+[DEFAULT]
+support-files =
+  ../../../../../../toolkit/components/extensions/test/mochitest/test_ext_all_apis.js
+tags = webextensions
+
+[test_ext_all_apis.html]
diff --git a/mobile/android/components/extensions/test/mochitest/test_ext_all_apis.html b/mobile/android/components/extensions/test/mochitest/test_ext_all_apis.html
new file mode 100644
index 0000000000..aec3eb7c13
--- /dev/null
+++ b/mobile/android/components/extensions/test/mochitest/test_ext_all_apis.html
@@ -0,0 +1,23 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>WebExtension test</title>
+  <meta charset="utf-8">
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
+</head>
+<body>
+<script>
+"use strict";
+/* exported expectedContentApisTargetSpecific, expectedBackgroundApisTargetSpecific */
+let expectedContentApisTargetSpecific = [
+];
+
+let expectedBackgroundApisTargetSpecific = [
+];
+</script>
+<script src="test_ext_all_apis.js"></script>
+</body>
+</html>
diff --git a/mobile/android/components/extensions/test/mochitest/test_ext_pageAction.html b/mobile/android/components/extensions/test/mochitest/test_ext_pageAction.html
new file mode 100644
index 0000000000..b13c551bdc
--- /dev/null
+++ b/mobile/android/components/extensions/test/mochitest/test_ext_pageAction.html
@@ -0,0 +1,99 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>PageAction Test</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SpawnTask.js"></script>
+  <script src="chrome://mochikit/content/tests/SimpleTest/ExtensionTestUtils.js"></script>
+  <script type="text/javascript" src="head.js"></script>
+  <link rel="stylesheet" href="chrome://mochikit/contents/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script type="text/javascript">
+"use strict";
+
+let dataURI = "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";
+
+let image = atob(dataURI);
+const IMAGE_ARRAYBUFFER = Uint8Array.from(image, byte => byte.charCodeAt(0)).buffer;
+
+function background() {
+  browser.test.assertTrue("pageAction" in browser, "Namespace 'pageAction' exists in browser");
+  browser.test.assertTrue("show" in browser.pageAction, "API method 'show' exists in browser.pageAction");
+
+  // TODO: Use the Tabs API to obtain the tab ids for showing pageActions.
+  let tabId = 1;
+  browser.test.onMessage.addListener(msg => {
+    if (msg === "pageAction-show") {
+      browser.pageAction.show(tabId).then(() => {
+        browser.test.sendMessage("page-action-shown");
+      });
+    } else if (msg === "pageAction-hide") {
+      browser.pageAction.hide(tabId).then(() => {
+        browser.test.sendMessage("page-action-hidden");
+      });
+    }
+  });
+
+  browser.pageAction.onClicked.addListener(tab => {
+    // TODO: Make sure we get the correct tab once basic tabs support is added.
+    browser.test.sendMessage("page-action-clicked");
+  });
+
+  let extensionInfo = {
+    // Extract the assigned uuid from the background page url.
+    uuid: `{${window.location.hostname}}`,
+  };
+
+  browser.test.sendMessage("ready", extensionInfo);
+}
+
+add_task(function* test_pageAction() {
+  let extension = ExtensionTestUtils.loadExtension({
+    background,
+    manifest: {
+      "name": "PageAction Extension",
+      "page_action": {
+        "default_title": "Page Action",
+        "default_icon": {
+          "18": "extension.png",
+        },
+      },
+      "applications": {
+        "gecko": {
+          "id": "foo@bar.com",
+        },
+      },
+    },
+    files: {
+      "extension.png": IMAGE_ARRAYBUFFER,
+    },
+  });
+
+  yield extension.startup();
+  let {uuid} = yield extension.awaitMessage("ready");
+
+  extension.sendMessage("pageAction-show");
+  yield extension.awaitMessage("page-action-shown");
+  ok(isPageActionShown(uuid), "The PageAction should be shown");
+
+  extension.sendMessage("pageAction-hide");
+  yield extension.awaitMessage("page-action-hidden");
+  ok(!isPageActionShown(uuid), "The PageAction should be hidden");
+
+  extension.sendMessage("pageAction-show");
+  yield extension.awaitMessage("page-action-shown");
+  ok(isPageActionShown(uuid), "The PageAction should be shown");
+
+  clickPageAction(uuid);
+  yield extension.awaitMessage("page-action-clicked");
+  ok(isPageActionShown(uuid), "The PageAction should still be shown after being clicked");
+
+  yield extension.unload();
+  ok(!isPageActionShown(uuid), "The PageAction should be removed after unload");
+});
+</script>
+
+</body>
+</html>
diff --git a/mobile/android/components/extensions/test/mochitest/test_ext_pageAction_popup.html b/mobile/android/components/extensions/test/mochitest/test_ext_pageAction_popup.html
new file mode 100644
index 0000000000..89edc7c298
--- /dev/null
+++ b/mobile/android/components/extensions/test/mochitest/test_ext_pageAction_popup.html
@@ -0,0 +1,169 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>PageAction Test</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SpawnTask.js"></script>
+  <script src="chrome://mochikit/content/tests/SimpleTest/ExtensionTestUtils.js"></script>
+  <script type="text/javascript" src="head.js"></script>
+  <link rel="stylesheet" href="chrome://mochikit/contents/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script type="text/javascript">
+"use strict";
+
+Cu.import("resource://gre/modules/Services.jsm");
+
+let dataURI = "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";
+
+let image = atob(dataURI);
+const IMAGE_ARRAYBUFFER = Uint8Array.from(image, byte => byte.charCodeAt(0)).buffer;
+
+add_task(function* test_contentscript() {
+  function background() {
+    // TODO: Use the Tabs API to obtain the tab ids for showing pageActions.
+    let tabId = 1;
+    let onClickedListenerEnabled = false;
+
+    browser.test.onMessage.addListener((msg, details) => {
+      if (msg === "page-action-show") {
+        // TODO: switch to using .show(tabId).then(...) once bug 1270742 lands.
+        browser.pageAction.show(tabId).then(() => {
+          browser.test.sendMessage("page-action-shown");
+        });
+      } else if (msg == "page-action-set-popup") {
+        browser.pageAction.setPopup({popup: details.name, tabId: tabId}).then(() => {
+          browser.test.sendMessage("page-action-popup-set");
+        });
+      } else if (msg == "page-action-get-popup") {
+        browser.pageAction.getPopup({tabId: tabId}).then(url => {
+          browser.test.sendMessage("page-action-got-popup", url);
+        });
+      } else if (msg == "page-action-enable-onClicked-listener") {
+        onClickedListenerEnabled = true;
+        browser.test.sendMessage("page-action-onClicked-listener-enabled");
+      } else if (msg == "page-action-disable-onClicked-listener") {
+        onClickedListenerEnabled = false;
+        browser.test.sendMessage("page-action-onClicked-listener-disabled");
+      }
+    });
+
+    browser.pageAction.onClicked.addListener(tab => {
+      browser.test.assertTrue(onClickedListenerEnabled, "The onClicked listener should only fire when it is enabled.");
+      browser.test.sendMessage("page-action-onClicked-fired");
+    });
+
+    let extensionInfo = {
+      // Extract the assigned uuid from the background page url.
+      uuid: `{${window.location.hostname}}`,
+    };
+
+    browser.test.sendMessage("ready", extensionInfo);
+  }
+
+  function popupScript() {
+    window.onload = () => {
+      browser.test.sendMessage("page-action-from-popup", location.href);
+    };
+    browser.test.onMessage.addListener((msg, details) => {
+      if (msg == "page-action-close-popup") {
+        if (details.location == location.href) {
+          window.close();
+        }
+      }
+    });
+  }
+
+  let extension = ExtensionTestUtils.loadExtension({
+    background,
+    manifest: {
+      "name": "PageAction Extension",
+      "page_action": {
+        "default_title": "Page Action",
+        "default_popup": "default.html",
+        "default_icon": {
+          "18": "extension.png",
+        },
+      },
+    },
+    files: {
+      "default.html": `<html><head><meta charset="utf-8"><script src="popup.js"><\/script></head></html>`,
+      "extension.png": IMAGE_ARRAYBUFFER,
+      "a.html": `<html><head><meta charset="utf-8"><script src="popup.js"><\/script></head></html>`,
+      "b.html": `<html><head><meta charset="utf-8"><script src="popup.js"><\/script></head></html>`,
+      "popup.js": popupScript,
+    },
+  });
+
+  let tabClosedPromise = () => {
+    return new Promise(resolve => {
+      let chromeWin = Services.wm.getMostRecentWindow("navigator:browser");
+      let BrowserApp = chromeWin.BrowserApp;
+
+      let tabCloseListener = (event) => {
+        BrowserApp.deck.removeEventListener("TabClose", tabCloseListener, false);
+        let browser = event.target;
+        let url = browser.currentURI.spec;
+        resolve(url);
+      };
+
+      BrowserApp.deck.addEventListener("TabClose", tabCloseListener, false);
+    });
+  };
+
+  function* testPopup(name, uuid) {
+    // We don't need to set the popup when testing default_popup.
+    if (name != "default.html") {
+      extension.sendMessage("page-action-set-popup", {name});
+      yield extension.awaitMessage("page-action-popup-set");
+    }
+
+    extension.sendMessage("page-action-get-popup");
+    let url = yield extension.awaitMessage("page-action-got-popup");
+
+    if (name == "") {
+      ok(url == name, "Calling pageAction.getPopup should return an empty string when the popup is not set.");
+
+      // The onClicked listener should get called when the popup is set to an empty string.
+      extension.sendMessage("page-action-enable-onClicked-listener");
+      yield extension.awaitMessage("page-action-onClicked-listener-enabled");
+
+      clickPageAction(uuid);
+      yield extension.awaitMessage("page-action-onClicked-fired");
+
+      extension.sendMessage("page-action-disable-onClicked-listener");
+      yield extension.awaitMessage("page-action-onClicked-listener-disabled");
+    } else {
+      ok(url.includes(name), "Calling pageAction.getPopup should return the correct popup URL when the popup is set.");
+
+      clickPageAction(uuid);
+      let location = yield extension.awaitMessage("page-action-from-popup");
+      ok(location.includes(name), "The popup with the correct URL should be shown.");
+
+      extension.sendMessage("page-action-close-popup", {location});
+
+      url = yield tabClosedPromise();
+      ok(url.includes(name), "The tab for the popup should be closed.");
+    }
+  }
+
+  yield extension.startup();
+  let {uuid} = yield extension.awaitMessage("ready");
+
+  extension.sendMessage("page-action-show");
+  yield extension.awaitMessage("page-action-shown");
+  ok(isPageActionShown(uuid), "The PageAction should be shown.");
+
+  yield testPopup("default.html", uuid);
+  yield testPopup("a.html", uuid);
+  yield testPopup("", uuid);
+  yield testPopup("b.html", uuid);
+
+  yield extension.unload();
+  ok(!isPageActionShown(uuid), "The PageAction should be removed after unload.");
+});
+</script>
+
+</body>
+</html>
diff --git a/mobile/android/components/moz.build b/mobile/android/components/moz.build
new file mode 100644
index 0000000000..cac34b603c
--- /dev/null
+++ b/mobile/android/components/moz.build
@@ -0,0 +1,48 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+XPIDL_SOURCES += [
+    'SessionStore.idl',
+]
+
+XPIDL_MODULE = 'MobileComponents'
+
+EXTRA_COMPONENTS += [
+    'AboutRedirector.js',
+    'AddonUpdateService.js',
+    'BlocklistPrompt.js',
+    'BrowserCLH.js',
+    'ColorPicker.js',
+    'ContentDispatchChooser.js',
+    'ContentPermissionPrompt.js',
+    'DirectoryProvider.js',
+    'FilePicker.js',
+    'FxAccountsPush.js',
+    'HelperAppDialog.js',
+    'ImageBlockingPolicy.js',
+    'LoginManagerPrompter.js',
+    'NSSDialogService.js',
+    'PersistentNotificationHandler.js',
+    'PresentationDevicePrompt.js',
+    'PresentationRequestUIGlue.js',
+    'PromptService.js',
+    'SessionStore.js',
+    'SiteSpecificUserAgent.js',
+    'Snippets.js',
+    'TabSource.js',
+    'XPIDialogService.js',
+]
+
+# Keep it this way if at all possible.  If you need preprocessing,
+# consider adding fields to AppConstants.jsm.
+EXTRA_PP_COMPONENTS += [
+    'MobileComponents.manifest',
+]
+
+DIRS += [
+    'extensions',
+    'build',
+]