diff -r 000000000000 -r 6474c204b198 toolkit/devtools/server/tests/browser/head.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/server/tests/browser/head.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,52 @@
+/* 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/. */
+let tempScope = {};
+Cu.import("resource://gre/modules/devtools/Loader.jsm", tempScope);
+Cu.import("resource://gre/modules/devtools/Console.jsm", tempScope);
+const require = tempScope.devtools.require;
+const console = tempScope.console;
+tempScope = null;
+const PATH = "browser/toolkit/devtools/server/tests/browser/";
+const MAIN_DOMAIN = "http://test1.example.org/" + PATH;
+const ALT_DOMAIN = "http://sectest1.example.org/" + PATH;
+const ALT_DOMAIN_SECURED = "https://sectest1.example.org:443/" + PATH;
+
+/**
+ * Open a new tab at a URL and call a callback on load
+ */
+function addTab(aURL, aCallback) {
+  waitForExplicitFinish();
+
+  gBrowser.selectedTab = gBrowser.addTab();
+  content.location = aURL;
+
+  let tab = gBrowser.selectedTab;
+  let browser = gBrowser.getBrowserForTab(tab);
+
+  function onTabLoad(event) {
+    if (event.originalTarget.location.href != aURL) {
+      return;
+    }
+    browser.removeEventListener("load", onTabLoad, true);
+    aCallback(browser.contentDocument);
+  }
+
+  browser.addEventListener("load", onTabLoad, true);
+}
+
+/**
+ * Forces GC, CC and Shrinking GC to get rid of disconnected docshells and
+ * windows.
+ */
+function forceCollections() {
+  Cu.forceGC();
+  Cu.forceCC();
+  Cu.forceShrinkingGC();
+}
+
+registerCleanupFunction(function tearDown() {
+  while (gBrowser.tabs.length > 1) {
+    gBrowser.removeCurrentTab();
+  }
+});