diff -r 000000000000 -r 6474c204b198 dom/plugins/test/unit/head_plugins.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/plugins/test/unit/head_plugins.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,191 @@
+/* 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 {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
+
+Cu.import("resource://gre/modules/Promise.jsm");
+
+const gIsWindows = ("@mozilla.org/windows-registry-key;1" in Cc);
+const gIsOSX = ("nsILocalFileMac" in Ci);
+const gIsLinux = ("@mozilla.org/gnome-gconf-service;1" in Cc) ||
+  ("@mozilla.org/gio-service;1" in Cc);
+const gDirSvc = Cc["@mozilla.org/file/directory_service;1"].getService(Ci.nsIProperties);
+
+// Finds the test plugin library
+function get_test_plugin(secondplugin=false) {
+  var pluginEnum = gDirSvc.get("APluginsDL", Ci.nsISimpleEnumerator);
+  while (pluginEnum.hasMoreElements()) {
+    let dir = pluginEnum.getNext().QueryInterface(Ci.nsILocalFile);
+    let name = get_platform_specific_plugin_name(secondplugin);
+    let plugin = dir.clone();
+    plugin.append(name);
+    if (plugin.exists()) {
+      plugin.normalize();
+      return plugin;
+    }
+  }
+  return null;
+}
+
+// Finds the test nsIPluginTag
+function get_test_plugintag(aName="Test Plug-in") {
+  const Cc = Components.classes;
+  const Ci = Components.interfaces;
+
+  var name = aName || "Test Plug-in";
+  var host = Cc["@mozilla.org/plugin/host;1"].
+             getService(Ci.nsIPluginHost);
+  var tags = host.getPluginTags();
+
+  for (var i = 0; i < tags.length; i++) {
+    if (tags[i].name == name)
+      return tags[i];
+  }
+  return null;
+}
+
+// Creates a fake ProfDS directory key, copied from do_get_profile
+function do_get_profile_startup() {
+  let env = Components.classes["@mozilla.org/process/environment;1"]
+                      .getService(Components.interfaces.nsIEnvironment);
+  // the python harness sets this in the environment for us
+  let profd = env.get("XPCSHELL_TEST_PROFILE_DIR");
+  let file = Components.classes["@mozilla.org/file/local;1"]
+                       .createInstance(Components.interfaces.nsILocalFile);
+  file.initWithPath(profd);
+
+  let dirSvc = Components.classes["@mozilla.org/file/directory_service;1"]
+                         .getService(Components.interfaces.nsIProperties);
+  let provider = {
+    getFile: function(prop, persistent) {
+      persistent.value = true;
+      if (prop == "ProfDS") {
+        return file.clone();
+      }
+      throw Components.results.NS_ERROR_FAILURE;
+    },
+    QueryInterface: function(iid) {
+      if (iid.equals(Components.interfaces.nsIDirectoryServiceProvider) ||
+          iid.equals(Components.interfaces.nsISupports)) {
+        return this;
+      }
+      throw Components.results.NS_ERROR_NO_INTERFACE;
+    }
+  };
+  dirSvc.QueryInterface(Components.interfaces.nsIDirectoryService)
+        .registerProvider(provider);
+  return file.clone();
+}
+
+function get_platform_specific_plugin_name(secondplugin=false) {
+  if (secondplugin) {
+    if (gIsWindows) return "npsecondtest.dll";
+    if (gIsOSX) return "SecondTest.plugin";
+    if (gIsLinux) return "libnpsecondtest.so";
+  } else {
+    if (gIsWindows) return "nptest.dll";
+    if (gIsOSX) return "Test.plugin";
+    if (gIsLinux) return "libnptest.so";
+  }
+  return null;
+}
+
+function get_platform_specific_plugin_suffix() {
+  if (gIsWindows) return ".dll";
+  else if (gIsOSX) return ".plugin";
+  else if (gIsLinux) return ".so";
+  else return null;
+}
+
+function get_test_plugin_no_symlink() {
+  let dirSvc = Cc["@mozilla.org/file/directory_service;1"]
+                .getService(Ci.nsIProperties);
+  let pluginEnum = dirSvc.get("APluginsDL", Ci.nsISimpleEnumerator);
+  while (pluginEnum.hasMoreElements()) {
+    let dir = pluginEnum.getNext().QueryInterface(Ci.nsILocalFile);
+    let plugin = dir.clone();
+    plugin.append(get_platform_specific_plugin_name());
+    if (plugin.exists()) {
+      return plugin;
+    }
+  }
+  return null;
+}
+
+let gGlobalScope = this;
+function loadAddonManager() {
+  let ns = {};
+  Cu.import("resource://gre/modules/Services.jsm", ns);
+  let head = "../../../../toolkit/mozapps/extensions/test/xpcshell/head_addons.js";
+  let file = do_get_file(head);
+  let uri = ns.Services.io.newFileURI(file);
+  ns.Services.scriptloader.loadSubScript(uri.spec, gGlobalScope);
+  createAppInfo("xpcshell@tests.mozilla.org", "XPCShell", "1", "1.9.2");
+  startupManager();
+}
+
+// Install addon and return a Promise<boolean> that is
+// resolve with true on success, false otherwise.
+function installAddon(relativePath) {
+  let deferred = Promise.defer();
+  let success = () => deferred.resolve(true);
+  let fail = () => deferred.resolve(false);
+  let listener = {
+    onDownloadCancelled: fail,
+    onDownloadFailed: fail,
+    onInstallCancelled: fail,
+    onInstallFailed: fail,
+    onInstallEnded: success,
+  };
+
+  let installCallback = install => {
+    install.addListener(listener);
+    install.install();
+  };
+
+  let file = do_get_file(relativePath, false);
+  AddonManager.getInstallForFile(file, installCallback,
+                                 "application/x-xpinstall");
+
+  return deferred.promise;
+}
+
+// Uninstall addon and return a Promise<boolean> that is
+// resolve with true on success, false otherwise.
+function uninstallAddon(id) {
+  let deferred = Promise.defer();
+
+  AddonManager.getAddonByID(id, addon => {
+    if (!addon) {
+      deferred.resolve(false);
+    }
+
+    let listener = {};
+    let handler = addon => {
+      if (addon.id !== id) {
+        return;
+      }
+
+      AddonManager.removeAddonListener(listener);
+      deferred.resolve(true);
+    };
+
+    listener.onUninstalled = handler;
+    listener.onDisabled = handler;
+
+    AddonManager.addAddonListener(listener);
+    addon.uninstall();
+  });
+
+  return deferred.promise;
+}
+
+// Returns a Promise<Addon> that is resolved with
+// the corresponding addon or rejected.
+function getAddonByID(id) {
+  let deferred = Promise.defer();
+  AddonManager.getAddonByID(id, addon => deferred.resolve(addon));
+  return deferred.promise;
+}