Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

27 files changed, 1581 insertions, 0 deletions

diff --git a/devtools/startup/aboutdevtools/AboutDevToolsRegistration.jsm b/devtools/startup/aboutdevtools/AboutDevToolsRegistration.jsm
new file mode 100644
index 0000000000..f3ae2ea4a9
--- /dev/null
+++ b/devtools/startup/aboutdevtools/AboutDevToolsRegistration.jsm
@@ -0,0 +1,40 @@
+/* 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/. */
+
+"use strict";
+
+// Register the about:devtools URL, that is opened whenever a user attempts to open
+// DevTools for the first time.
+const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+
+const { nsIAboutModule } = Ci;
+
+function AboutDevtools() {}
+
+AboutDevtools.prototype = {
+  uri: Services.io.newURI(
+    "chrome://devtools-startup/content/aboutdevtools/aboutdevtools.xhtml"
+  ),
+  classDescription: "about:devtools",
+  classID: Components.ID("3a16d383-92bd-4c24-ac10-0e2bd66883ab"),
+  contractID: "@mozilla.org/network/protocol/about;1?what=devtools",
+
+  QueryInterface: ChromeUtils.generateQI([nsIAboutModule]),
+
+  newChannel: function(uri, loadInfo) {
+    const chan = Services.io.newChannelFromURIWithLoadInfo(this.uri, loadInfo);
+    chan.owner = Services.scriptSecurityManager.getSystemPrincipal();
+    return chan;
+  },
+
+  getURIFlags: function(uri) {
+    return nsIAboutModule.ALLOW_SCRIPT;
+  },
+
+  getChromeURI: function(_uri) {
+    return this.uri;
+  },
+};
+
+var EXPORTED_SYMBOLS = ["AboutDevtools"];
diff --git a/devtools/startup/aboutdevtools/aboutdevtools.css b/devtools/startup/aboutdevtools/aboutdevtools.css
new file mode 100644
index 0000000000..e054b7566f
--- /dev/null
+++ b/devtools/startup/aboutdevtools/aboutdevtools.css
@@ -0,0 +1,189 @@
+/* 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/. */
+
+:root {
+  --white: #ffffff;
+
+  /* Shared variables */
+  --line-height: 1.5em;
+}
+
+html, body {
+  min-width: 600px;
+}
+
+body {
+  margin-top: 17vh;
+}
+
+p {
+  line-height: var(--line-height);
+}
+
+.box {
+  max-width: 850px;
+  display: flex;
+  flex-shrink: 0;
+  padding: 0 0 50px 0;
+  /* Compensate for the optional scrollbar. */
+  margin-right: calc(100% - 100vw);
+}
+
+.wrapper {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+}
+
+.left-pane {
+  width: 300px;
+  height: 300px;
+  margin-inline-end: 20px;
+  background-image: url(images/otter.svg);
+  background-size: 100%;
+  background-position: 50%;
+  background-repeat: no-repeat;
+  flex-shrink: 0;
+}
+
+.features {
+  max-width: 980px;
+  border-top: 1px solid var(--in-content-border-color);
+}
+
+.features-list {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  grid-gap: 40px 20px;
+  margin: 60px 20px;
+  padding: 0;
+}
+
+.feature-icon {
+  width: 60%;
+  max-width: 180px;
+  margin-bottom: 10px;
+}
+
+.feature {
+  list-style: none;
+  text-align: center;
+  margin: 10px 0;
+}
+
+.feature-name {
+  display: block;
+  margin: 10px 0;
+  font-size: 28px;
+  font-weight: 300;
+}
+
+.feature-name span {
+  display: block;
+}
+
+.feature-desc {
+  margin: 1em 20px;
+}
+
+.feature-link {
+  display: block;
+  color: inherit;
+}
+
+.feature-more-link {
+  display: block;
+  margin-top: 10px;
+}
+
+.external::after {
+  content: "";
+
+  display: inline-block;
+  height: 16px;
+  width: 16px;
+
+  margin: -.3rem .15rem 0 0.25rem;
+  vertical-align: middle;
+
+  background-image: url(images/external-link.svg);
+  background-repeat: no-repeat;
+  background-size: 16px 16px;
+
+  -moz-context-properties: fill;
+  fill: currentColor;
+}
+
+.title {
+  font-weight: 300;
+  font-size: 32px;
+  margin-top: 16px;
+  line-height: 44px;
+}
+
+.buttons-container {
+  display: flex;
+  margin-top: 5px;
+}
+
+.buttons-container button:not(:last-child) {
+  margin-right: 10px;
+}
+
+button {
+  margin: 20px 0 0 0;
+  padding: 10px 20px;
+
+  font-size: 15px;
+  font-weight: 400;
+  line-height: 21px;
+  cursor: pointer;
+}
+
+/* Remove light gray outline when clicking on the button */
+button::-moz-focus-inner {
+  border: 0;
+}
+
+[hidden="true"] {
+  display: none;
+}
+
+footer {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 100%;
+  min-height: 300px;
+  flex-grow: 1;
+  padding-bottom: 15px;
+  color: var(--white);
+  background: linear-gradient(0, var(--blue-60), var(--blue-80));
+}
+
+.dev-edition-logo {
+  flex-shrink: 0;
+  width: 165px;
+  margin: 20px 50px 0 0;
+}
+
+.footer-message {
+  max-width: 460px;
+}
+
+.footer-message-title {
+  color: var(--white);
+}
+
+.footer-link {
+  display: block;
+  margin-top: 10px;
+}
+
+.footer-link,
+.footer-link:hover,
+.footer-link:visited,
+.footer-link:hover:active {
+  color: var(--white);
+}
diff --git a/devtools/startup/aboutdevtools/aboutdevtools.js b/devtools/startup/aboutdevtools/aboutdevtools.js
new file mode 100644
index 0000000000..9eac396675
--- /dev/null
+++ b/devtools/startup/aboutdevtools/aboutdevtools.js
@@ -0,0 +1,253 @@
+/* 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/. */
+
+"use strict";
+
+const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+
+const DEVTOOLS_ENABLED_PREF = "devtools.enabled";
+
+const MESSAGES = {
+  AboutDebugging: "about-debugging-message",
+  ContextMenu: "inspect-element-message",
+  HamburgerMenu: "menu-message",
+  KeyShortcut: "key-shortcut-message",
+  SystemMenu: "menu-message",
+};
+
+// Google analytics parameters that should be added to all outgoing links.
+const GA_PARAMETERS = [
+  ["utm_source", "devtools"],
+  ["utm_medium", "onboarding"],
+];
+
+const KEY_SHORTCUTS_STRINGS =
+  "chrome://devtools-startup/locale/key-shortcuts.properties";
+const keyShortcutsBundle = Services.strings.createBundle(KEY_SHORTCUTS_STRINGS);
+
+// URL constructor doesn't support about: scheme,
+// we have to use http in order to have working searchParams.
+const url = new URL(window.location.href.replace("about:", "http://"));
+const reason = url.searchParams.get("reason");
+const tabid = parseInt(url.searchParams.get("tabid"), 10);
+
+function getToolboxShortcut() {
+  const modifier = Services.appinfo.OS == "Darwin" ? "Cmd+Opt+" : "Ctrl+Shift+";
+  return (
+    modifier + keyShortcutsBundle.GetStringFromName("toggleToolbox.commandkey")
+  );
+}
+
+function onInstallButtonClick() {
+  Services.prefs.setBoolPref("devtools.enabled", true);
+}
+
+function onCloseButtonClick() {
+  window.close();
+}
+
+function updatePage() {
+  const installPage = document.getElementById("install-page");
+  const welcomePage = document.getElementById("welcome-page");
+  const isEnabled = Services.prefs.getBoolPref("devtools.enabled");
+  if (isEnabled) {
+    installPage.setAttribute("hidden", "true");
+    welcomePage.removeAttribute("hidden");
+  } else {
+    welcomePage.setAttribute("hidden", "true");
+    installPage.removeAttribute("hidden");
+  }
+}
+
+/**
+ * Array of descriptors for features displayed on about:devtools.
+ * Each feature should contain:
+ * - icon: the name of the image to use
+ * - title: the key of the localized title (from aboutDevTools.ftl)
+ * - desc: the key of the localized description (from aboutDevTools.ftl)
+ * - link: the MDN documentation link
+ */
+const features = [
+  {
+    icon:
+      "chrome://devtools-startup/content/aboutdevtools/images/feature-inspector.svg",
+    title: "features-inspector-title",
+    desc: "features-inspector-desc",
+    link: "https://developer.mozilla.org/docs/Tools/Page_Inspector",
+  },
+  {
+    icon:
+      "chrome://devtools-startup/content/aboutdevtools/images/feature-console.svg",
+    title: "features-console-title",
+    desc: "features-console-desc",
+    link: "https://developer.mozilla.org/docs/Tools/Web_Console",
+  },
+  {
+    icon:
+      "chrome://devtools-startup/content/aboutdevtools/images/feature-debugger.svg",
+    title: "features-debugger-title",
+    desc: "features-debugger-desc",
+    link: "https://developer.mozilla.org/docs/Tools/Debugger",
+  },
+  {
+    icon:
+      "chrome://devtools-startup/content/aboutdevtools/images/feature-network.svg",
+    title: "features-network-title",
+    desc: "features-network-desc",
+    link: "https://developer.mozilla.org/docs/Tools/Network_Monitor",
+  },
+  {
+    icon:
+      "chrome://devtools-startup/content/aboutdevtools/images/feature-storage.svg",
+    title: "features-storage-title",
+    desc: "features-storage-desc",
+    link: "https://developer.mozilla.org/docs/Tools/Storage_Inspector",
+  },
+  {
+    icon:
+      "chrome://devtools-startup/content/aboutdevtools/images/feature-responsive.svg",
+    title: "features-responsive-title",
+    desc: "features-responsive-desc",
+    link: "https://developer.mozilla.org/docs/Tools/Responsive_Design_Mode",
+  },
+  {
+    icon:
+      "chrome://devtools-startup/content/aboutdevtools/images/feature-visualediting.svg",
+    title: "features-visual-editing-title",
+    desc: "features-visual-editing-desc",
+    link: "https://developer.mozilla.org/docs/Tools/Style_Editor",
+  },
+  {
+    icon:
+      "chrome://devtools-startup/content/aboutdevtools/images/feature-performance.svg",
+    title: "features-performance-title",
+    desc: "features-performance-desc",
+    link: "https://developer.mozilla.org/docs/Tools/Performance",
+  },
+  {
+    icon:
+      "chrome://devtools-startup/content/aboutdevtools/images/feature-memory.svg",
+    title: "features-memory-title",
+    desc: "features-memory-desc",
+    link: "https://developer.mozilla.org/docs/Tools/Memory",
+  },
+];
+
+/**
+ * Helper to create a DOM element to represent a DevTools feature.
+ */
+function createFeatureEl(feature) {
+  const li = document.createElement("li");
+  li.classList.add("feature");
+
+  const { icon, link, title, desc } = feature;
+  // eslint-disable-next-line no-unsanitized/property
+  li.innerHTML = `
+    <h3 class="feature-name">
+      <a class="feature-link" href="${link}" target="_blank">
+        <img class="feature-icon" src="${icon}" alt="" />
+        <span data-l10n-id="${title}"></span>
+      </a>
+    </h3>
+    <p class="feature-desc" data-l10n-id="${desc}">
+      <a class="feature-more-link external" href="${link}"
+         aria-hidden="true" tabindex="-1"
+         target="_blank" data-l10n-name="learn-more"></a>
+    </p>`;
+
+  return li;
+}
+
+window.addEventListener(
+  "load",
+  function() {
+    const inspectorShortcut = getToolboxShortcut();
+    const welcomeMessage = document.getElementById("welcome-message");
+
+    // Set the welcome message content with the correct keyboard shortcut for the current
+    // platform.
+    document.l10n.setAttributes(welcomeMessage, "welcome-message", {
+      shortcut: inspectorShortcut,
+    });
+
+    // Set the appropriate title message.
+    if (reason == "ContextMenu") {
+      document.getElementById("inspect-title").removeAttribute("hidden");
+    } else {
+      document.getElementById("common-title").removeAttribute("hidden");
+    }
+
+    // Display the message specific to the reason
+    const id = MESSAGES[reason];
+    if (id) {
+      const message = document.getElementById(id);
+      message.removeAttribute("hidden");
+    }
+
+    // Attach event listeners
+    document
+      .getElementById("install")
+      .addEventListener("click", onInstallButtonClick);
+    document
+      .getElementById("close")
+      .addEventListener("click", onCloseButtonClick);
+    Services.prefs.addObserver(DEVTOOLS_ENABLED_PREF, updatePage);
+
+    const featuresContainer = document.querySelector(".features-list");
+    for (const feature of features) {
+      featuresContainer.appendChild(createFeatureEl(feature));
+    }
+
+    // Add Google Analytics parameters to all the external links.
+    const externalLinks = document.querySelectorAll("a[href*='mozilla.org']");
+    for (const link of externalLinks) {
+      const linkUrl = new URL(link.getAttribute("href"));
+      GA_PARAMETERS.forEach(([key, value]) =>
+        linkUrl.searchParams.set(key, value)
+      );
+      link.setAttribute("href", linkUrl.href);
+    }
+
+    // Update the current page based on the current value of DEVTOOLS_ENABLED_PREF.
+    updatePage();
+  },
+  { once: true }
+);
+
+window.addEventListener(
+  "beforeunload",
+  function() {
+    // Focus the tab that triggered the DevTools onboarding.
+    if (document.visibilityState != "visible") {
+      // Only try to focus the correct tab if the current tab is the about:devtools page.
+      return;
+    }
+
+    // Retrieve the original tab if it is still available.
+    const browserWindow = Services.wm.getMostRecentWindow("navigator:browser");
+    const { gBrowser } = browserWindow;
+    const originalBrowser = gBrowser.getBrowserForOuterWindowID(tabid);
+    const originalTab = gBrowser.getTabForBrowser(originalBrowser);
+
+    if (originalTab) {
+      // If the original tab was found, select it.
+      gBrowser.selectedTab = originalTab;
+    }
+  },
+  { once: true }
+);
+
+window.addEventListener(
+  "unload",
+  function() {
+    document
+      .getElementById("install")
+      .removeEventListener("click", onInstallButtonClick);
+    document
+      .getElementById("close")
+      .removeEventListener("click", onCloseButtonClick);
+    Services.prefs.removeObserver(DEVTOOLS_ENABLED_PREF, updatePage);
+  },
+  { once: true }
+);
diff --git a/devtools/startup/aboutdevtools/aboutdevtools.xhtml b/devtools/startup/aboutdevtools/aboutdevtools.xhtml
new file mode 100644
index 0000000000..5b0709e9a5
--- /dev/null
+++ b/devtools/startup/aboutdevtools/aboutdevtools.xhtml
@@ -0,0 +1,108 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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/. -->
+<!DOCTYPE html [
+<!ENTITY % htmlDTD PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd"> %htmlDTD;
+<!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd"> %globalDTD;
+]>
+
+<html xmlns="http://www.w3.org/1999/xhtml" dir="&locale.dir;">
+<head>
+  <meta http-equiv="Content-Security-Policy" content="default-src chrome:; object-src 'none'" />
+  <title data-l10n-id="head-title"></title>
+  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>a
+  <link rel="stylesheet" href="chrome://global/skin/in-content/common.css" type="text/css"/>
+  <link rel="stylesheet" href="chrome://devtools-startup/content/aboutdevtools/aboutdevtools.css"  type="text/css"/>
+  <link rel="stylesheet" href="chrome://devtools-startup/content/aboutdevtools/subscribe.css"  type="text/css"/>
+  <script src="chrome://devtools-startup/content/aboutdevtools/aboutdevtools.js"></script>
+  <script src="chrome://devtools-startup/content/aboutdevtools/subscribe.js"></script>
+  <link rel="localization" href="devtools/startup/aboutDevTools.ftl" />
+</head>
+<body>
+  <div id="install-page" class="wrapper" hidden="true">
+    <div class="box">
+      <div class="left-pane" />
+      <div class="right-pane">
+        <h1 class="title" id="common-title" hidden="true" data-l10n-id="enable-title"></h1>
+        <h1 class="title" id="inspect-title" hidden="true" data-l10n-id="enable-inspect-element-title"></h1>
+
+        <!-- Include all the possible message, hidden by default
+             as we can't lazily load localized strings from dtd -->
+        <p id="about-debugging-message" hidden="true" data-l10n-id="enable-about-debugging-message"></p>
+        <p id="menu-message" hidden="true" data-l10n-id="enable-menu-message"></p>
+        <p id="key-shortcut-message" hidden="true" data-l10n-id="enable-key-shortcut-message"></p>
+        <p id="inspect-element-message" hidden="true" data-l10n-id="enable-inspect-element-message"></p>
+
+        <p data-l10n-id="enable-common-message"></p>
+        <a class="external installpage-link" href="https://developer.mozilla.org/docs/Tools" target="_blank" data-l10n-id="enable-learn-more-link"></a>
+        <div class="buttons-container">
+          <button class="primary" id="install" data-l10n-id="enable-enable-button"></button>
+          <button id="close" data-l10n-id="enable-close-button"></button>
+        </div>
+      </div>
+    </div>
+  </div>
+
+  <!-- This page, hidden by default is displayed once the add-on is installed -->
+  <div id="welcome-page" class="wrapper" hidden="true">
+    <div class="box">
+      <div class="left-pane" />
+      <div class="right-pane">
+        <h1 class="title" data-l10n-id="welcome-title"></h1>
+        <!-- The welcome message is dynamically updated with a keyboard shortcut at
+             runtime and added in aboutdevtools.js -->
+        <p id="welcome-message"></p>
+
+        <!-- Form dedicated to the newsletter subscription -->
+        <div class="newsletter">
+          <h2 class="newsletter-title" data-l10n-id="newsletter-title"></h2>
+          <p data-l10n-id="newsletter-message"></p>
+
+          <form id="newsletter-form" name="newsletter-form" action="https://www.mozilla.org/en-US/newsletter/" method="post">
+            <!-- "H" stands for the HTML format (->fmt). Alternative is T for text. -->
+            <input type="hidden" id="fmt" name="fmt" value="H" />
+            <!-- "app-dev" is the id of the Mozilla Developper newsletter -->
+            <input type="hidden" id="newsletters" name="newsletters" value="app-dev" />
+            <div id="newsletter-errors"></div>
+            <section id="newsletter-email" class="newsletter-form-section">
+              <input type="email" id="email" name="email" required="true" data-l10n-id="newsletter-email-placeholder" data-l10n-attrs="placeholder" />
+            </section>
+
+            <section id="newsletter-privacy" class="newsletter-form-section">
+              <input type="checkbox" id="privacy" name="privacy" required="true" />
+              <label for="privacy" data-l10n-id="newsletter-privacy-label">
+                <a class="external" href="https://www.mozilla.org/privacy/" data-l10n-name="privacy-policy"></a>
+              </label>
+            </section>
+            <button type="submit" id="newsletter-submit" class="primary" data-l10n-id="newsletter-subscribe-button"></button>
+          </form>
+          <div id="newsletter-thanks">
+            <h2 class="newsletter-title" data-l10n-id="newsletter-thanks-title"></h2>
+            <p data-l10n-id="newsletter-thanks-message"></p>
+          </div>
+        </div>
+      </div>
+    </div>
+
+    <div class="features">
+      <ul class="features-list">
+      </ul>
+    </div>
+
+    <footer>
+      <img class="dev-edition-logo"
+           src="chrome://devtools-startup/content/aboutdevtools/images/dev-edition-logo.svg"
+           alt="" />
+      <div class="footer-message">
+        <h1 class="footer-message-title" data-l10n-id="footer-title"></h1>
+        <p data-l10n-id="footer-message"></p>
+        <a class="external footer-link"
+           href="https://www.mozilla.org/firefox/developer/"
+           target="_blank" data-l10n-id="footer-learn-more-link"></a>
+      </div>
+    </footer>
+  </div>
+
+</body>
+</html>
diff --git a/devtools/startup/aboutdevtools/components.conf b/devtools/startup/aboutdevtools/components.conf
new file mode 100644
index 0000000000..e9ea6846f8
--- /dev/null
+++ b/devtools/startup/aboutdevtools/components.conf
@@ -0,0 +1,14 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+Classes = [
+    {
+        'cid': '{3a16d383-92bd-4c24-ac10-0e2bd66883ab}',
+        'contract_ids': ['@mozilla.org/network/protocol/about;1?what=devtools'],
+        'jsm': 'resource:///modules/AboutDevToolsRegistration.jsm',
+        'constructor': 'AboutDevtools',
+    },
+]
diff --git a/devtools/startup/aboutdevtools/images/dev-edition-logo.svg b/devtools/startup/aboutdevtools/images/dev-edition-logo.svg
new file mode 100644
index 0000000000..65d1c49759
--- /dev/null
+++ b/devtools/startup/aboutdevtools/images/dev-edition-logo.svg
@@ -0,0 +1,251 @@
+<!-- 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/. -->
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <defs>
+    <linearGradient x1="42%" y1="-10%" x2="61%" y2="114%" id="f">
+      <stop stop-color="#AAF2FF" offset="0%"/>
+      <stop stop-color="#0DF" offset="29%"/>
+      <stop stop-color="#0090ED" offset="61%"/>
+      <stop stop-color="#0250BB" offset="89%"/>
+    </linearGradient>
+    <linearGradient x1="38%" y1="0%" x2="63%" y2="124%" id="g">
+      <stop stop-color="#AAF2FF" offset="0%"/>
+      <stop stop-color="#0DF" offset="29%"/>
+      <stop stop-color="#0090ED" offset="74%"/>
+      <stop stop-color="#0250BB" offset="100%"/>
+    </linearGradient>
+    <linearGradient x1="86%" y1="15%" x2="20%" y2="84%" id="k">
+      <stop stop-color="#80EBFF" stop-opacity=".5" offset="24%"/>
+      <stop stop-color="#0DF" stop-opacity="0" offset="70%"/>
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new file mode 100644
index 0000000000..956c09ba63
--- /dev/null
+++ b/devtools/startup/aboutdevtools/images/external-link.svg
@@ -0,0 +1,7 @@
+<!-- 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/. -->
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
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new file mode 100644
index 0000000000..f24cad3606
--- /dev/null
+++ b/devtools/startup/aboutdevtools/images/feature-console.svg
@@ -0,0 +1,9 @@
+<!-- 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/. -->
+<svg viewBox="0 0 220 120" fill="none" xmlns="http://www.w3.org/2000/svg">
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new file mode 100644
index 0000000000..d38a1aff6b
--- /dev/null
+++ b/devtools/startup/aboutdevtools/images/feature-debugger.svg
@@ -0,0 +1,9 @@
+<!-- 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/. -->
+<svg viewBox="0 0 220 120" fill="none" xmlns="http://www.w3.org/2000/svg">
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+</svg>
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new file mode 100644
index 0000000000..953c498983
--- /dev/null
+++ b/devtools/startup/aboutdevtools/images/feature-inspector.svg
@@ -0,0 +1,9 @@
+<!-- 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/. -->
+<svg viewBox="0 0 220 120" fill="none" xmlns="http://www.w3.org/2000/svg">
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+</svg>
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new file mode 100644
index 0000000000..f2bc1e4fbc
--- /dev/null
+++ b/devtools/startup/aboutdevtools/images/feature-memory.svg
@@ -0,0 +1,9 @@
+<!-- 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/. -->
+<svg viewBox="0 0 220 120" fill="none" xmlns="http://www.w3.org/2000/svg">
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+</svg>
diff --git a/devtools/startup/aboutdevtools/images/feature-network.svg b/devtools/startup/aboutdevtools/images/feature-network.svg
new file mode 100644
index 0000000000..d37e7d5db7
--- /dev/null
+++ b/devtools/startup/aboutdevtools/images/feature-network.svg
@@ -0,0 +1,10 @@
+<!-- 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/. -->
+<svg viewBox="0 0 220 120" fill="none" xmlns="http://www.w3.org/2000/svg">
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+  <path d="M102.57 55H51.5a2.5 2.5 0 000 5h51.07a2.5 2.5 0 100-5z" fill="#0080FF"/>
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+  <path d="M144.58 55H116.5a2.5 2.5 0 100 5h28.08a2.5 2.5 0 100-5z" fill="#0080FF"/>
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+</svg>
diff --git a/devtools/startup/aboutdevtools/images/feature-performance.svg b/devtools/startup/aboutdevtools/images/feature-performance.svg
new file mode 100644
index 0000000000..520527c91a
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+++ b/devtools/startup/aboutdevtools/images/feature-performance.svg
@@ -0,0 +1,14 @@
+<!-- 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/. -->
+<svg viewBox="0 0 220 120" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <path d="M156.54 32.33v57.72c0 4.05-3.45 7.34-7.7 7.34H57.16c-4.26 0-7.7-3.29-7.7-7.34V32.33" stroke="#0080FF" stroke-width="5"/>
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diff --git a/devtools/startup/aboutdevtools/images/feature-responsive.svg b/devtools/startup/aboutdevtools/images/feature-responsive.svg
new file mode 100644
index 0000000000..e76870ea7b
--- /dev/null
+++ b/devtools/startup/aboutdevtools/images/feature-responsive.svg
@@ -0,0 +1,14 @@
+<!-- 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/. -->
+<svg viewBox="0 0 220 120" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <path d="M119.5 52h-60a1.5 1.5 0 000 3h60a1.5 1.5 0 000-3zM114.5 65h-55a1.5 1.5 0 000 3h55a1.5 1.5 0 000-3zM97.5 40h-38a1.5 1.5 0 000 3h38a1.5 1.5 0 000-3zM97.5 77h-38a1.5 1.5 0 000 3h38a1.5 1.5 0 000-3z" fill="#00C7D8"/>
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+  <path fill-rule="evenodd" d="M154.37 14.46H48.63c-1.2 0-2.17.97-2.17 2.16V27.2h110.07V16.62c0-1.2-.97-2.16-2.16-2.16" fill="#0080FF"/>
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new file mode 100644
index 0000000000..f816ee5ca4
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+++ b/devtools/startup/aboutdevtools/images/feature-storage.svg
@@ -0,0 +1,9 @@
+<!-- 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/. -->
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+      <stop stop-color="#00C8D7"/>
+      <stop offset="1" stop-color="#0A84FF"/>
+    </linearGradient>
+    <linearGradient id="paint1_linear" x1="82.96" y1="50.04" x2="441.7" y2="408.76" gradientUnits="userSpaceOnUse">
+      <stop stop-color="#CCFBFF"/>
+      <stop offset="1" stop-color="#C9E4FF"/>
+    </linearGradient>
+  </defs>
+</svg>
diff --git a/devtools/startup/aboutdevtools/moz.build b/devtools/startup/aboutdevtools/moz.build
new file mode 100644
index 0000000000..2b25782368
--- /dev/null
+++ b/devtools/startup/aboutdevtools/moz.build
@@ -0,0 +1,15 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+EXTRA_JS_MODULES += [
+    "AboutDevToolsRegistration.jsm",
+]
+
+XPCOM_MANIFESTS += [
+    "components.conf",
+]
+
+BROWSER_CHROME_MANIFESTS += ["test/browser.ini"]
diff --git a/devtools/startup/aboutdevtools/subscribe.css b/devtools/startup/aboutdevtools/subscribe.css
new file mode 100644
index 0000000000..0096bc1e8f
--- /dev/null
+++ b/devtools/startup/aboutdevtools/subscribe.css
@@ -0,0 +1,94 @@
+/* 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/. */
+
+/**
+ * This file contains the styles for the newsletter subscription form on about:devtools.
+ * It is largely inspired from https://mozilla.github.io/basket-example/
+ */
+
+.newsletter-title {
+  font-size: 17px;
+  font-weight: 500;
+  margin-top: 26px;
+  margin-bottom: -4px;
+}
+
+#newsletter-errors {
+  /* Hidden by default */
+  display: none;
+
+  margin-bottom: 20px;
+  padding: 10px;
+  border-radius: 2px;
+
+  background-color: var(--red-50);
+  color: var(--white);
+}
+
+#newsletter-errors.show {
+  display: block;
+}
+
+#newsletter-errors .error {
+  margin: 0;
+  margin-bottom: 10px;
+}
+
+#newsletter-errors .error:last-child {
+  margin-bottom: 0;
+}
+
+#newsletter-thanks {
+  /* Hidden by default */
+  display: none;
+}
+
+#newsletter-thanks.show {
+  display: block;
+}
+
+.newsletter-form-section {
+  display: block;
+  margin-bottom: 20px;
+  width: 320px;
+}
+
+#newsletter-privacy {
+  display: flex;
+
+  /* The privacy section is hidden by default and only displayed on focus */
+  height: 0;
+  overflow: hidden;
+
+  padding: 3px 0 0 3px;
+  margin: -3px 0 -20px -3px;
+}
+
+#newsletter-privacy.animate {
+  transition: all 0.25s cubic-bezier(.15,.75,.35,.9);
+}
+
+#newsletter-privacy label {
+  line-height: var(--line-height);
+}
+
+#privacy {
+  width: 20px;
+  height: 20px;
+  margin-top: 2px;
+  margin-inline-end: 10px;
+  flex-shrink: 0;
+}
+
+#email {
+  width: 100%;
+  box-sizing: border-box;
+  margin: 4px 0;
+  padding: 8px;
+}
+
+#newsletter-submit {
+  display: block;
+  padding: 8px 20px;
+}
diff --git a/devtools/startup/aboutdevtools/subscribe.js b/devtools/startup/aboutdevtools/subscribe.js
new file mode 100644
index 0000000000..7e18b5a578
--- /dev/null
+++ b/devtools/startup/aboutdevtools/subscribe.js
@@ -0,0 +1,158 @@
+/* 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/. */
+
+"use strict";
+
+/**
+ * This file handles the newsletter subscription form on about:devtools.
+ * It is largely inspired from https://mozilla.github.io/basket-example/
+ */
+
+window.addEventListener(
+  "load",
+  function() {
+    // Timeout for the subscribe XHR.
+    const REQUEST_TIMEOUT = 5000;
+
+    const emailInput = document.getElementById("email");
+    const newsletterErrors = document.getElementById("newsletter-errors");
+    const newsletterForm = document.getElementById("newsletter-form");
+    const newsletterPrivacySection = document.getElementById(
+      "newsletter-privacy"
+    );
+    const newsletterThanks = document.getElementById("newsletter-thanks");
+
+    /**
+     * Update the error panel to display the provided errors. If the argument is null or
+     * empty, a default error message will be displayed.
+     *
+     * @param {Array} errors
+     *        Array of strings, each item being an error message to display.
+     */
+    async function updateErrorPanel(errors) {
+      clearErrorPanel();
+
+      if (!errors || errors.length == 0) {
+        errors = [
+          await document.l10n.formatValues([
+            { id: "newsletter-error-unknown" },
+          ]),
+        ];
+      }
+
+      // Create errors markup.
+      const fragment = document.createDocumentFragment();
+      for (const error of errors) {
+        const item = document.createElement("p");
+        item.classList.add("error");
+        item.appendChild(document.createTextNode(error));
+        fragment.appendChild(item);
+      }
+
+      newsletterErrors.appendChild(fragment);
+      newsletterErrors.classList.add("show");
+    }
+
+    /**
+     * Hide the error panel and remove all errors.
+     */
+    function clearErrorPanel() {
+      newsletterErrors.classList.remove("show");
+      newsletterErrors.innerHTML = "";
+    }
+
+    // Show the additional form fields on focus of the email input.
+    function onEmailInputFocus() {
+      // Create a hidden measuring container, append it to the parent of the privacy section
+      const container = document.createElement("div");
+      container.style.cssText =
+        "visibility: hidden; overflow: hidden; position: absolute";
+      newsletterPrivacySection.parentNode.appendChild(container);
+
+      // Clone the privacy section, append the clone to the measuring container.
+      const clone = newsletterPrivacySection.cloneNode(true);
+      container.appendChild(clone);
+
+      // Measure the target height of the privacy section.
+      clone.style.height = "auto";
+      const height = clone.offsetHeight;
+
+      // Cleanup the measuring container.
+      container.remove();
+
+      // Set the animate class and set the height to the measured height.
+      newsletterPrivacySection.classList.add("animate");
+      newsletterPrivacySection.style.cssText = `height: ${height}px; margin-bottom: 0;`;
+    }
+
+    // XHR subscribe; handle errors; display thanks message on success.
+    function onFormSubmit(evt) {
+      evt.preventDefault();
+      evt.stopPropagation();
+
+      // New submission, clear old errors
+      clearErrorPanel();
+
+      const xhr = new XMLHttpRequest();
+
+      xhr.onload = async function(r) {
+        if (r.target.status >= 200 && r.target.status < 300) {
+          const { response } = r.target;
+
+          if (response.success === true) {
+            // Hide form and show success message.
+            newsletterForm.style.display = "none";
+            newsletterThanks.classList.add("show");
+          } else {
+            // We trust the error messages from the service to be meaningful for the user.
+            updateErrorPanel(response.errors);
+          }
+        } else {
+          const { status, statusText } = r.target;
+          const statusInfo = `${status} - ${statusText}`;
+          const error = await document.l10n.formatValues([
+            {
+              id: "newsletter-error-common",
+              args: { errorDescription: statusInfo },
+            },
+          ]);
+          updateErrorPanel([error]);
+        }
+      };
+
+      xhr.onerror = () => {
+        updateErrorPanel();
+      };
+
+      xhr.ontimeout = async () => {
+        const error = await document.l10n.formatValues([
+          { id: "newsletter-error-timeout" },
+        ]);
+        updateErrorPanel([error]);
+      };
+
+      const url = newsletterForm.getAttribute("action");
+
+      xhr.open("POST", url, true);
+      xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
+      xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
+      xhr.timeout = REQUEST_TIMEOUT;
+      xhr.responseType = "json";
+
+      // Create form data.
+      const formData = new FormData(newsletterForm);
+      formData.append("source_url", document.location.href);
+
+      const params = new URLSearchParams(formData);
+
+      // Send the request.
+      xhr.send(params.toString());
+    }
+
+    // Attach event listeners.
+    newsletterForm.addEventListener("submit", onFormSubmit);
+    emailInput.addEventListener("focus", onEmailInputFocus);
+  },
+  { once: true }
+);
diff --git a/devtools/startup/aboutdevtools/test/.eslintrc.js b/devtools/startup/aboutdevtools/test/.eslintrc.js
new file mode 100644
index 0000000000..3d0bd99e1b
--- /dev/null
+++ b/devtools/startup/aboutdevtools/test/.eslintrc.js
@@ -0,0 +1,6 @@
+"use strict";
+
+module.exports = {
+  // Extend from the shared list of defined globals for mochitests.
+  extends: "../../../.eslintrc.mochitests.js",
+};
diff --git a/devtools/startup/aboutdevtools/test/browser.ini b/devtools/startup/aboutdevtools/test/browser.ini
new file mode 100644
index 0000000000..bcac4d3fbf
--- /dev/null
+++ b/devtools/startup/aboutdevtools/test/browser.ini
@@ -0,0 +1,11 @@
+[DEFAULT]
+tags = devtools
+subsuite = devtools
+support-files =
+  head.js
+
+[browser_aboutdevtools_closes_page.js]
+[browser_aboutdevtools_enables_devtools.js]
+[browser_aboutdevtools_focus_owner_tab.js]
+[browser_aboutdevtools_reuse_existing.js]
+skip-if = (verify && (os == 'mac' || os == 'linux'))
diff --git a/devtools/startup/aboutdevtools/test/browser_aboutdevtools_closes_page.js b/devtools/startup/aboutdevtools/test/browser_aboutdevtools_closes_page.js
new file mode 100644
index 0000000000..baa8f3f43e
--- /dev/null
+++ b/devtools/startup/aboutdevtools/test/browser_aboutdevtools_closes_page.js
@@ -0,0 +1,25 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* eslint-env browser */
+
+add_task(async function() {
+  pushPref("devtools.enabled", false);
+
+  const { doc, win } = await openAboutDevTools();
+
+  info("Check that the close button is available on the page");
+  const closeButton = doc.getElementById("close");
+  ok(closeButton, "close button is displayed");
+
+  const onWindowUnload = new Promise(r =>
+    win.addEventListener("unload", r, { once: true })
+  );
+  info("Click on the install button to enable DevTools.");
+  EventUtils.synthesizeMouseAtCenter(closeButton, {}, win);
+
+  info("Wait for the about:devtools tab to be closed");
+  await onWindowUnload;
+});
diff --git a/devtools/startup/aboutdevtools/test/browser_aboutdevtools_enables_devtools.js b/devtools/startup/aboutdevtools/test/browser_aboutdevtools_enables_devtools.js
new file mode 100644
index 0000000000..e0f7324ed8
--- /dev/null
+++ b/devtools/startup/aboutdevtools/test/browser_aboutdevtools_enables_devtools.js
@@ -0,0 +1,39 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* eslint-env browser */
+
+add_task(async function() {
+  pushPref("devtools.enabled", false);
+
+  const { tab, doc, win } = await openAboutDevTools();
+
+  const installPage = doc.getElementById("install-page");
+  const welcomePage = doc.getElementById("welcome-page");
+
+  info(
+    "Check that about:devtools is in the correct state with devtools.enabled=false"
+  );
+  ok(!installPage.hasAttribute("hidden"), "install screen is visible");
+  ok(welcomePage.hasAttribute("hidden"), "welcome screen is hidden");
+
+  info("Click on the install button to enable DevTools.");
+  const installButton = doc.getElementById("install");
+  EventUtils.synthesizeMouseAtCenter(installButton, {}, win);
+
+  info("Wait until the UI updates");
+  await waitUntil(() => installPage.hasAttribute("hidden") === true);
+  ok(!welcomePage.hasAttribute("hidden"), "welcome screen is visible");
+  ok(
+    Services.prefs.getBoolPref("devtools.enabled"),
+    "The preference devtools.enabled has been flipped to true."
+  );
+
+  // Flip the devtools.enabled preference back to false, otherwise the pushPref cleanup
+  // times out.
+  Services.prefs.setBoolPref("devtools.enabled", false);
+
+  await removeTab(tab);
+});
diff --git a/devtools/startup/aboutdevtools/test/browser_aboutdevtools_focus_owner_tab.js b/devtools/startup/aboutdevtools/test/browser_aboutdevtools_focus_owner_tab.js
new file mode 100644
index 0000000000..d0d9a96d79
--- /dev/null
+++ b/devtools/startup/aboutdevtools/test/browser_aboutdevtools_focus_owner_tab.js
@@ -0,0 +1,91 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* eslint-env browser */
+
+/**
+ * When closing about:devtools, test that the tab where the user triggered about:devtools
+ * is selected again.
+ */
+add_task(async function() {
+  await pushPref("devtools.enabled", false);
+
+  info("Add an about:blank tab");
+  const tab1 = await addTab("data:text/html;charset=utf-8,tab1");
+  const tab2 = await addTab("data:text/html;charset=utf-8,tab2");
+  ok(
+    tab1 === gBrowser.tabs[1],
+    "tab1 is the second tab in the current browser window"
+  );
+
+  info("Select the first tab");
+  gBrowser.selectedTab = tab1;
+
+  synthesizeToggleToolboxKey();
+
+  info("Wait for the about:devtools tab to be selected");
+  await waitUntil(() => isAboutDevtoolsTab(gBrowser.selectedTab));
+  info("about:devtools was opened as expected.");
+
+  const aboutDevtoolsTab = gBrowser.selectedTab;
+  ok(
+    aboutDevtoolsTab === gBrowser.tabs[2],
+    "about:devtools was opened next to its owner tab"
+  );
+
+  info("Move the owner tab to the end of the tabs array.");
+  gBrowser.moveTabTo(tab1, gBrowser.tabs.length - 1);
+  await removeTab(aboutDevtoolsTab);
+
+  await waitUntil(() => tab1 == gBrowser.selectedTab);
+  info("The correct tab was selected after closing about:devtools.");
+
+  await removeTab(tab1);
+  await removeTab(tab2);
+});
+
+/**
+ * When closing about:devtools, test that the current tab is not updated if
+ * about:devtools was not the selectedTab.
+ */
+add_task(async function() {
+  await pushPref("devtools.enabled", false);
+
+  info("Add an about:blank tab");
+  const tab1 = await addTab("data:text/html;charset=utf-8,tab1");
+  const tab2 = await addTab("data:text/html;charset=utf-8,tab2");
+  ok(
+    tab1 === gBrowser.tabs[1],
+    "tab1 is the second tab in the current browser window"
+  );
+
+  info("Select the first tab");
+  gBrowser.selectedTab = tab1;
+
+  synthesizeToggleToolboxKey();
+
+  info("Wait for the about:devtools tab to be selected");
+  await waitUntil(() => isAboutDevtoolsTab(gBrowser.selectedTab));
+  info("about:devtools was opened as expected.");
+
+  const aboutDevtoolsTab = gBrowser.selectedTab;
+  ok(
+    aboutDevtoolsTab === gBrowser.tabs[2],
+    "about:devtools was opened next to its owner tab"
+  );
+
+  info("Select the second tab");
+  gBrowser.selectedTab = tab2;
+
+  const aboutDevtoolsDocument = aboutDevtoolsTab.linkedBrowser.contentDocument;
+  await waitUntil(() => aboutDevtoolsDocument.visibilityState === "hidden");
+
+  await removeTab(aboutDevtoolsTab);
+
+  ok(tab2 == gBrowser.selectedTab, "Tab 2 should still be selected.");
+
+  await removeTab(tab1);
+  await removeTab(tab2);
+});
diff --git a/devtools/startup/aboutdevtools/test/browser_aboutdevtools_reuse_existing.js b/devtools/startup/aboutdevtools/test/browser_aboutdevtools_reuse_existing.js
new file mode 100644
index 0000000000..96c7ddc10c
--- /dev/null
+++ b/devtools/startup/aboutdevtools/test/browser_aboutdevtools_reuse_existing.js
@@ -0,0 +1,46 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* eslint-env browser */
+
+/**
+ * Test that only one tab of about:devtools is used for a given window.
+ */
+add_task(async function() {
+  await pushPref("devtools.enabled", false);
+
+  info("Add an about:blank tab");
+  const tab = await addTab("about:blank");
+
+  synthesizeToggleToolboxKey();
+
+  info("Wait for the about:devtools tab to be selected");
+  await waitUntil(() => isAboutDevtoolsTab(gBrowser.selectedTab));
+
+  // Keep a reference on this tab to assert it later on.
+  const aboutDevtoolsTab = gBrowser.selectedTab;
+
+  info("Select the about:blank tab again");
+  gBrowser.selectedTab = tab;
+
+  synthesizeToggleToolboxKey();
+
+  info("Wait for the about:devtools tab to be selected");
+  await waitUntil(() => isAboutDevtoolsTab(gBrowser.selectedTab));
+
+  // filter is not available on gBrowser.tabs.
+  const aboutDevtoolsTabs = [...gBrowser.tabs].filter(isAboutDevtoolsTab);
+  ok(
+    aboutDevtoolsTabs.length === 1,
+    "Only one tab of about:devtools was opened."
+  );
+  ok(
+    aboutDevtoolsTabs[0] === aboutDevtoolsTab,
+    "The existing about:devtools tab was reused."
+  );
+
+  await removeTab(aboutDevtoolsTab);
+  await removeTab(tab);
+});
diff --git a/devtools/startup/aboutdevtools/test/head.js b/devtools/startup/aboutdevtools/test/head.js
new file mode 100644
index 0000000000..d5f85d0aca
--- /dev/null
+++ b/devtools/startup/aboutdevtools/test/head.js
@@ -0,0 +1,113 @@
+/* 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;
+}