1 files changed, 58 insertions, 0 deletions
diff --git a/browser/base/content/autorecovery.js b/browser/base/content/autorecovery.js
new file mode 100644
index 000000000..78c7a5bd8
--- /dev/null
+++ b/browser/base/content/autorecovery.js
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+/* 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/. */
+
+/* Auto-recovery module.
+ * This module aims to catch fatal browser initialization errors and either
+ * automatically correct likely causes from them, or automatically restarting
+ * the browser in safe mode. This is hooked into the browser's "onload"
+ * event because it can be assumed that at that point, everything must
+ * have been properly initialized already.
+ */
+
+var Cc = Components.classes;
+var Ci = Components.interfaces;
+var Cu = Components.utils;
+
+// Services = object with smart getters for common XPCOM services
+Cu.import("resource://gre/modules/Services.jsm");
+
+var browser_autoRecovery = {
+  onLoad: function() {
+    var nsIAS = Ci.nsIAppStartup; // Application startup interface
+    
+    if (typeof gBrowser === "undefined") {
+      // gBrowser should always be defined at this point, but if it is not, then most likely 
+      // it is due to an incompatible or outdated language pack being installed and selected.
+      // In this case, we reset "general.useragent.locale" to try to recover browser startup.
+      if (Services.prefs.prefHasUserValue("general.useragent.locale")) {
+        // Restart automatically in en-US.
+        Services.prefs.clearUserPref("general.useragent.locale");
+        Cc["@mozilla.org/toolkit/app-startup;1"].getService(nsIAS).quit(nsIAS.eRestart | nsIAS.eAttemptQuit);
+      } else if (!Services.appinfo.inSafeMode) {
+        // gBrowser isn't defined, and we're not using a custom locale. Most likely
+        // a user-installed add-on causes issues here, so we restart in Safe Mode.
+        let RISM = Services.prompt.confirm(null, "Error",
+                                           "The Browser didn't start properly!\n"+
+                                           "This is usually caused by an add-on or misconfiguration.\n\n"+
+                                           "Restart in Safe Mode?");
+        if (RISM) {
+          Cc["@mozilla.org/toolkit/app-startup;1"].getService(nsIAS).restartInSafeMode(nsIAS.eRestart | nsIAS.eAttemptQuit);
+        } else {
+          // Force quit application
+          Cc["@mozilla.org/toolkit/app-startup;1"].getService(nsIAS).quit(nsIAS.eForceQuit);
+        }
+      }
+      // Something else caused this issue and we're already in Safe Mode, so we return
+      // without doing anything else, and let normal error handling take place.
+      return;
+    } // gBrowser undefined
+    
+    // Other checks than gBrowser undefined can go here!
+    
+    // Remove our listener, since we don't want this to fire on every load.
+    window.removeEventListener("load", browser_autoRecovery.onLoad, false);
+  }
+};
+
+window.addEventListener("load", browser_autoRecovery.onLoad, false);