diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_bug578534.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_bug578534.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* 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/. */
+
+function test() {
+  let uriString = "http://example.com/";
+  let cookieBehavior = "network.cookie.cookieBehavior";
+  let uriObj = Services.io.newURI(uriString, null, null)
+  let cp = Components.classes["@mozilla.org/cookie/permission;1"]
+                     .getService(Components.interfaces.nsICookiePermission);
+  
+  Services.prefs.setIntPref(cookieBehavior, 2);
+
+  cp.setAccess(uriObj, cp.ACCESS_ALLOW);
+  gBrowser.selectedTab = gBrowser.addTab(uriString);
+  waitForExplicitFinish();
+  gBrowser.selectedBrowser.addEventListener("load", onTabLoaded, true);
+  
+  function onTabLoaded() {
+    is(gBrowser.selectedBrowser.contentWindow.navigator.cookieEnabled, true,
+       "navigator.cookieEnabled should be true");
+    // Clean up
+    gBrowser.selectedBrowser.removeEventListener("load", onTabLoaded, true);
+    gBrowser.removeTab(gBrowser.selectedTab);
+    Services.prefs.setIntPref(cookieBehavior, 0);
+    cp.setAccess(uriObj, cp.ACCESS_DEFAULT);
+    finish();
+  }
+}