--- a/browser/components/preferences/cookies.js
+++ b/browser/components/preferences/cookies.js
@@ -1,15 +1,16 @@
 /* -*- indent-tabs-mode: nil; js-indent-level: 4 -*- */
 /* 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 nsICookie = Components.interfaces.nsICookie;
 
+Components.utils.import("resource://gre/modules/AppConstants.jsm");
 Components.utils.import("resource://gre/modules/PluralForm.jsm");
 Components.utils.import("resource://gre/modules/Services.jsm")
 Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
 
 XPCOMUtils.defineLazyModuleGetter(this, "ContextualIdentityService",
                                   "resource://gre/modules/ContextualIdentityService.jsm");
 
 var gCookiesWindow = {