diff -r 000000000000 -r 6474c204b198 dom/identity/nsIDService.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/identity/nsIDService.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+/* 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");
+
+this.IDService = function IDService() {
+  this.wrappedJSObject = this;
+};
+
+this.IDService.prototype = {
+  classID: Components.ID("{4e0a0e98-b1d3-4745-a1eb-f815199dd06b}"),
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
+                                         Ci.nsISupportsWeakReference]),
+
+  observe: function observe(subject, topic, data) {
+    switch (topic) {
+      case "app-startup":
+        Services.obs.addObserver(this, "final-ui-startup", true);
+        break;
+      case "final-ui-startup":
+        // Startup DOMIdentity.jsm
+        Cu.import("resource://gre/modules/DOMIdentity.jsm");
+        DOMIdentity._init();
+        break;
+    }
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([IDService]);