diff -r 000000000000 -r 6474c204b198 dom/tests/mochitest/webapps/head.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/tests/mochitest/webapps/head.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,48 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function runAll(steps) {
+  SimpleTest.waitForExplicitFinish();
+
+  /**
+   * On Mac, apps aren't considered launchable right after they've been
+   * installed because the OS takes some time to detect them (so
+   * nsIMacWebAppUtils::pathForAppWithIdentifier() returns null).
+   * That causes methods like mgmt.getAll() to exclude the app from their
+   * results, even though the app is installed and is in the registry.
+   * See the tests under toolkit/webapps for a viable solution.
+   *
+   * To work around this problem, set allAppsLaunchable to true, which makes
+   * all apps considered as launchable.
+   */
+  SpecialPowers.setAllAppsLaunchable(true);
+
+  // Clone the array so we don't modify the original.
+  steps = steps.concat();
+  function next() {
+    if (steps.length) {
+      steps.shift()(next);
+    }
+    else {
+      SimpleTest.finish();
+    }
+  }
+  next();
+}
+
+function confirmNextInstall() {
+  var Ci = SpecialPowers.Ci;
+
+  var popupPanel = SpecialPowers.wrap(window).top.
+                   QueryInterface(Ci.nsIInterfaceRequestor).
+                   getInterface(Ci.nsIWebNavigation).
+                   QueryInterface(Ci.nsIDocShell).
+                   chromeEventHandler.ownerDocument.defaultView.
+                   PopupNotifications.panel;
+
+  function onPopupShown() {
+    popupPanel.removeEventListener("popupshown", onPopupShown, false);
+    SpecialPowers.wrap(this).childNodes[0].button.doCommand();
+  }
+  popupPanel.addEventListener("popupshown", onPopupShown, false);
+}