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diff --git a/devtools/client/webconsole/utils.js b/devtools/client/webconsole/utils.js
new file mode 100644
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+++ b/devtools/client/webconsole/utils.js
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+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft= javascript ts=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 {Cc, Ci, Cu, components} = require("chrome");
+const Services = require("Services");
+const {LocalizationHelper} = require("devtools/shared/l10n");
+
+// Match the function name from the result of toString() or toSource().
+//
+// Examples:
+// (function foobar(a, b) { ...
+// function foobar2(a) { ...
+// function() { ...
+const REGEX_MATCH_FUNCTION_NAME = /^\(?function\s+([^(\s]+)\s*\(/;
+
+// Number of terminal entries for the self-xss prevention to go away
+const CONSOLE_ENTRY_THRESHOLD = 5;
+
+const CONSOLE_WORKER_IDS = exports.CONSOLE_WORKER_IDS = [
+  "SharedWorker",
+  "ServiceWorker",
+  "Worker"
+];
+
+var WebConsoleUtils = {
+
+  /**
+   * Wrap a string in an nsISupportsString object.
+   *
+   * @param string string
+   * @return nsISupportsString
+   */
+  supportsString: function (string) {
+    let str = Cc["@mozilla.org/supports-string;1"]
+              .createInstance(Ci.nsISupportsString);
+    str.data = string;
+    return str;
+  },
+
+  /**
+   * Clone an object.
+   *
+   * @param object object
+   *        The object you want cloned.
+   * @param boolean recursive
+   *        Tells if you want to dig deeper into the object, to clone
+   *        recursively.
+   * @param function [filter]
+   *        Optional, filter function, called for every property. Three
+   *        arguments are passed: key, value and object. Return true if the
+   *        property should be added to the cloned object. Return false to skip
+   *        the property.
+   * @return object
+   *         The cloned object.
+   */
+  cloneObject: function (object, recursive, filter) {
+    if (typeof object != "object") {
+      return object;
+    }
+
+    let temp;
+
+    if (Array.isArray(object)) {
+      temp = [];
+      Array.forEach(object, function (value, index) {
+        if (!filter || filter(index, value, object)) {
+          temp.push(recursive ? WebConsoleUtils.cloneObject(value) : value);
+        }
+      });
+    } else {
+      temp = {};
+      for (let key in object) {
+        let value = object[key];
+        if (object.hasOwnProperty(key) &&
+            (!filter || filter(key, value, object))) {
+          temp[key] = recursive ? WebConsoleUtils.cloneObject(value) : value;
+        }
+      }
+    }
+
+    return temp;
+  },
+
+  /**
+   * Copies certain style attributes from one element to another.
+   *
+   * @param nsIDOMNode from
+   *        The target node.
+   * @param nsIDOMNode to
+   *        The destination node.
+   */
+  copyTextStyles: function (from, to) {
+    let win = from.ownerDocument.defaultView;
+    let style = win.getComputedStyle(from);
+    to.style.fontFamily = style.getPropertyCSSValue("font-family").cssText;
+    to.style.fontSize = style.getPropertyCSSValue("font-size").cssText;
+    to.style.fontWeight = style.getPropertyCSSValue("font-weight").cssText;
+    to.style.fontStyle = style.getPropertyCSSValue("font-style").cssText;
+  },
+
+  /**
+   * Create a grip for the given value. If the value is an object,
+   * an object wrapper will be created.
+   *
+   * @param mixed value
+   *        The value you want to create a grip for, before sending it to the
+   *        client.
+   * @param function objectWrapper
+   *        If the value is an object then the objectWrapper function is
+   *        invoked to give us an object grip. See this.getObjectGrip().
+   * @return mixed
+   *         The value grip.
+   */
+  createValueGrip: function (value, objectWrapper) {
+    switch (typeof value) {
+      case "boolean":
+        return value;
+      case "string":
+        return objectWrapper(value);
+      case "number":
+        if (value === Infinity) {
+          return { type: "Infinity" };
+        } else if (value === -Infinity) {
+          return { type: "-Infinity" };
+        } else if (Number.isNaN(value)) {
+          return { type: "NaN" };
+        } else if (!value && 1 / value === -Infinity) {
+          return { type: "-0" };
+        }
+        return value;
+      case "undefined":
+        return { type: "undefined" };
+      case "object":
+        if (value === null) {
+          return { type: "null" };
+        }
+        // Fall through.
+      case "function":
+        return objectWrapper(value);
+      default:
+        console.error("Failed to provide a grip for value of " + typeof value
+                      + ": " + value);
+        return null;
+    }
+  },
+
+  /**
+   * Determine if the given request mixes HTTP with HTTPS content.
+   *
+   * @param string request
+   *        Location of the requested content.
+   * @param string location
+   *        Location of the current page.
+   * @return boolean
+   *         True if the content is mixed, false if not.
+   */
+  isMixedHTTPSRequest: function (request, location) {
+    try {
+      let requestURI = Services.io.newURI(request, null, null);
+      let contentURI = Services.io.newURI(location, null, null);
+      return (contentURI.scheme == "https" && requestURI.scheme != "https");
+    } catch (ex) {
+      return false;
+    }
+  },
+
+  /**
+   * Helper function to deduce the name of the provided function.
+   *
+   * @param funtion function
+   *        The function whose name will be returned.
+   * @return string
+   *         Function name.
+   */
+  getFunctionName: function (func) {
+    let name = null;
+    if (func.name) {
+      name = func.name;
+    } else {
+      let desc;
+      try {
+        desc = func.getOwnPropertyDescriptor("displayName");
+      } catch (ex) {
+        // Ignore.
+      }
+      if (desc && typeof desc.value == "string") {
+        name = desc.value;
+      }
+    }
+    if (!name) {
+      try {
+        let str = (func.toString() || func.toSource()) + "";
+        name = (str.match(REGEX_MATCH_FUNCTION_NAME) || [])[1];
+      } catch (ex) {
+        // Ignore.
+      }
+    }
+    return name;
+  },
+
+  /**
+   * Get the object class name. For example, the |window| object has the Window
+   * class name (based on [object Window]).
+   *
+   * @param object object
+   *        The object you want to get the class name for.
+   * @return string
+   *         The object class name.
+   */
+  getObjectClassName: function (object) {
+    if (object === null) {
+      return "null";
+    }
+    if (object === undefined) {
+      return "undefined";
+    }
+
+    let type = typeof object;
+    if (type != "object") {
+      // Grip class names should start with an uppercase letter.
+      return type.charAt(0).toUpperCase() + type.substr(1);
+    }
+
+    let className;
+
+    try {
+      className = ((object + "").match(/^\[object (\S+)\]$/) || [])[1];
+      if (!className) {
+        className = ((object.constructor + "")
+                     .match(/^\[object (\S+)\]$/) || [])[1];
+      }
+      if (!className && typeof object.constructor == "function") {
+        className = this.getFunctionName(object.constructor);
+      }
+    } catch (ex) {
+      // Ignore.
+    }
+
+    return className;
+  },
+
+  /**
+   * Check if the given value is a grip with an actor.
+   *
+   * @param mixed grip
+   *        Value you want to check if it is a grip with an actor.
+   * @return boolean
+   *         True if the given value is a grip with an actor.
+   */
+  isActorGrip: function (grip) {
+    return grip && typeof (grip) == "object" && grip.actor;
+  },
+
+  /**
+   * Value of devtools.selfxss.count preference
+   *
+   * @type number
+   * @private
+   */
+  _usageCount: 0,
+  get usageCount() {
+    if (WebConsoleUtils._usageCount < CONSOLE_ENTRY_THRESHOLD) {
+      WebConsoleUtils._usageCount =
+        Services.prefs.getIntPref("devtools.selfxss.count");
+      if (Services.prefs.getBoolPref("devtools.chrome.enabled")) {
+        WebConsoleUtils.usageCount = CONSOLE_ENTRY_THRESHOLD;
+      }
+    }
+    return WebConsoleUtils._usageCount;
+  },
+  set usageCount(newUC) {
+    if (newUC <= CONSOLE_ENTRY_THRESHOLD) {
+      WebConsoleUtils._usageCount = newUC;
+      Services.prefs.setIntPref("devtools.selfxss.count", newUC);
+    }
+  },
+  /**
+   * The inputNode "paste" event handler generator. Helps prevent
+   * self-xss attacks
+   *
+   * @param nsIDOMElement inputField
+   * @param nsIDOMElement notificationBox
+   * @returns A function to be added as a handler to 'paste' and
+   *'drop' events on the input field
+   */
+  pasteHandlerGen: function (inputField, notificationBox, msg, okstring) {
+    let handler = function (event) {
+      if (WebConsoleUtils.usageCount >= CONSOLE_ENTRY_THRESHOLD) {
+        inputField.removeEventListener("paste", handler);
+        inputField.removeEventListener("drop", handler);
+        return true;
+      }
+      if (notificationBox.getNotificationWithValue("selfxss-notification")) {
+        event.preventDefault();
+        event.stopPropagation();
+        return false;
+      }
+
+      let notification = notificationBox.appendNotification(msg,
+        "selfxss-notification", null,
+        notificationBox.PRIORITY_WARNING_HIGH, null,
+        function (eventType) {
+          // Cleanup function if notification is dismissed
+          if (eventType == "removed") {
+            inputField.removeEventListener("keyup", pasteKeyUpHandler);
+          }
+        });
+
+      function pasteKeyUpHandler(event2) {
+        let value = inputField.value || inputField.textContent;
+        if (value.includes(okstring)) {
+          notificationBox.removeNotification(notification);
+          inputField.removeEventListener("keyup", pasteKeyUpHandler);
+          WebConsoleUtils.usageCount = CONSOLE_ENTRY_THRESHOLD;
+        }
+      }
+      inputField.addEventListener("keyup", pasteKeyUpHandler);
+
+      event.preventDefault();
+      event.stopPropagation();
+      return false;
+    };
+    return handler;
+  },
+};
+
+exports.Utils = WebConsoleUtils;
+
+// Localization
+
+WebConsoleUtils.L10n = function (bundleURI) {
+  this._helper = new LocalizationHelper(bundleURI);
+};
+
+WebConsoleUtils.L10n.prototype = {
+  /**
+   * Generates a formatted timestamp string for displaying in console messages.
+   *
+   * @param integer [milliseconds]
+   *        Optional, allows you to specify the timestamp in milliseconds since
+   *        the UNIX epoch.
+   * @return string
+   *         The timestamp formatted for display.
+   */
+  timestampString: function (milliseconds) {
+    let d = new Date(milliseconds ? milliseconds : null);
+    let hours = d.getHours(), minutes = d.getMinutes();
+    let seconds = d.getSeconds();
+    milliseconds = d.getMilliseconds();
+    let parameters = [hours, minutes, seconds, milliseconds];
+    return this.getFormatStr("timestampFormat", parameters);
+  },
+
+  /**
+   * Retrieve a localized string.
+   *
+   * @param string name
+   *        The string name you want from the Web Console string bundle.
+   * @return string
+   *         The localized string.
+   */
+  getStr: function (name) {
+    try {
+      return this._helper.getStr(name);
+    } catch (ex) {
+      console.error("Failed to get string: " + name);
+      throw ex;
+    }
+  },
+
+  /**
+   * Retrieve a localized string formatted with values coming from the given
+   * array.
+   *
+   * @param string name
+   *        The string name you want from the Web Console string bundle.
+   * @param array array
+   *        The array of values you want in the formatted string.
+   * @return string
+   *         The formatted local string.
+   */
+  getFormatStr: function (name, array) {
+    try {
+      return this._helper.getFormatStr(name, ...array);
+    } catch (ex) {
+      console.error("Failed to format string: " + name);
+      throw ex;
+    }
+  },
+};