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diff --git a/devtools/startup/aboutdevtools/test/head.js b/devtools/startup/aboutdevtools/test/head.js
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+++ b/devtools/startup/aboutdevtools/test/head.js
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+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint no-unused-vars: [2, {"vars": "local"}] */
+
+"use strict";
+
+// All test are asynchronous
+waitForExplicitFinish();
+
+/**
+ * Waits until a predicate returns true.
+ *
+ * @param function predicate
+ *        Invoked once in a while until it returns true.
+ * @param number interval [optional]
+ *        How often the predicate is invoked, in milliseconds.
+ */
+const waitUntil = function(predicate, interval = 100) {
+  if (predicate()) {
+    return Promise.resolve(true);
+  }
+  return new Promise(resolve => {
+    setTimeout(function() {
+      waitUntil(predicate, interval).then(() => resolve(true));
+    }, interval);
+  });
+};
+
+/**
+ * Open the provided url in a new tab.
+ */
+const addTab = async function(url) {
+  info("Adding a new tab with URL: " + url);
+
+  const { gBrowser } = window;
+
+  const tab = BrowserTestUtils.addTab(gBrowser, url);
+  gBrowser.selectedTab = tab;
+
+  await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+
+  info("Tab added and finished loading");
+
+  return tab;
+};
+
+/**
+ * Remove the given tab.
+ * @param {Object} tab The tab to be removed.
+ * @return Promise<undefined> resolved when the tab is successfully removed.
+ */
+const removeTab = async function(tab) {
+  info("Removing tab.");
+
+  const { gBrowser } = tab.ownerGlobal;
+
+  await new Promise(resolve => {
+    gBrowser.tabContainer.addEventListener("TabClose", resolve, { once: true });
+    gBrowser.removeTab(tab);
+  });
+
+  info("Tab removed and finished closing");
+};
+
+/**
+ * Open a new tab on about:devtools
+ */
+const openAboutDevTools = async function() {
+  info("Open about:devtools programmatically in a new tab");
+  const tab = await addTab("about:devtools");
+
+  const browser = tab.linkedBrowser;
+  const doc = browser.contentDocument;
+  const win = browser.contentWindow;
+
+  return { tab, doc, win };
+};
+
+/**
+ * Copied from devtools shared-head.js.
+ * Set a temporary value for a preference, that will be cleaned up after the test.
+ */
+const pushPref = function(preferenceName, value) {
+  return new Promise(resolve => {
+    const options = { set: [[preferenceName, value]] };
+    SpecialPowers.pushPrefEnv(options, resolve);
+  });
+};
+
+/**
+ * Helper to call the toggle devtools shortcut.
+ */
+function synthesizeToggleToolboxKey() {
+  info("Trigger the toogle toolbox shortcut");
+  if (Services.appinfo.OS == "Darwin") {
+    EventUtils.synthesizeKey("i", { accelKey: true, altKey: true });
+  } else {
+    EventUtils.synthesizeKey("i", { accelKey: true, shiftKey: true });
+  }
+}
+
+/**
+ * Helper to check if a given tab is about:devtools.
+ */
+function isAboutDevtoolsTab(tab) {
+  const browser = tab.linkedBrowser;
+  // browser.documentURI might be unavailable if the tab is loading.
+  if (browser && browser.documentURI) {
+    const location = browser.documentURI.spec;
+    return location.startsWith("about:devtools");
+  }
+  return false;
+}