diff -r 000000000000 -r 6474c204b198 toolkit/modules/ResetProfile.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/modules/ResetProfile.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,84 @@
+/* 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";
+
+this.EXPORTED_SYMBOLS = ["ResetProfile"];
+
+const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
+#expand const MOZ_APP_NAME = "__MOZ_APP_NAME__";
+#expand const MOZ_BUILD_APP = "__MOZ_BUILD_APP__";
+
+Cu.import("resource://gre/modules/Services.jsm");
+
+this.ResetProfile = {
+  /**
+   * Check if reset is supported for the currently running profile.
+   *
+   * @return boolean whether reset is supported.
+   */
+  resetSupported: function() {
+    let profileService = Cc["@mozilla.org/toolkit/profile-service;1"].
+                         getService(Ci.nsIToolkitProfileService);
+    let currentProfileDir = Services.dirsvc.get("ProfD", Ci.nsIFile);
+
+    // Reset is only supported for the default profile if the self-migrator used for reset exists.
+    try {
+      return currentProfileDir.equals(profileService.selectedProfile.rootDir) &&
+        ("@mozilla.org/profile/migrator;1?app=" + MOZ_BUILD_APP + "&type=" + MOZ_APP_NAME in Cc);
+    } catch (e) {
+      // Catch exception when there is no selected profile.
+      Cu.reportError(e);
+    }
+    return false;
+  },
+
+  getMigratedData: function() {
+    Cu.import("resource:///modules/MigrationUtils.jsm");
+
+    // From migration.properties
+    const MIGRATED_TYPES = [
+      128,// Windows/Tabs
+      4,  // History and Bookmarks
+      16, // Passwords
+      8,  // Form History
+      2,  // Cookies
+    ];
+
+    // Loop over possible data to migrate to give the user a list of what will be preserved.
+    let dataTypes = [];
+    for (let itemID of MIGRATED_TYPES) {
+      try {
+        let typeName = MigrationUtils.getLocalizedString(itemID + "_" + MOZ_APP_NAME);
+        dataTypes.push(typeName);
+      } catch (x) {
+        // Catch exceptions when the string for a data type doesn't exist.
+        Cu.reportError(x);
+      }
+    }
+    return dataTypes;
+  },
+
+  /**
+   * Ask the user if they wish to restart the application to reset the profile.
+   */
+  openConfirmationDialog: function(window) {
+    // Prompt the user to confirm.
+    let params = {
+      reset: false,
+    };
+    window.openDialog("chrome://global/content/resetProfile.xul", null,
+                      "chrome,modal,centerscreen,titlebar,dialog=yes", params);
+    if (!params.reset)
+      return;
+
+    // Set the reset profile environment variable.
+    let env = Cc["@mozilla.org/process/environment;1"]
+                .getService(Ci.nsIEnvironment);
+    env.set("MOZ_RESET_PROFILE_RESTART", "1");
+
+    let appStartup = Cc["@mozilla.org/toolkit/app-startup;1"].getService(Ci.nsIAppStartup);
+    appStartup.quit(Ci.nsIAppStartup.eForceQuit | Ci.nsIAppStartup.eRestart);
+  },
+};