Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

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

1 files changed, 1393 insertions, 0 deletions

diff --git a/devtools/startup/DevToolsStartup.sys.mjs b/devtools/startup/DevToolsStartup.sys.mjs
new file mode 100644
index 0000000000..34ebe6389d
--- /dev/null
+++ b/devtools/startup/DevToolsStartup.sys.mjs
@@ -0,0 +1,1393 @@
+/* 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 XPCOM component is loaded very early.
+ * Be careful to lazy load dependencies as much as possible.
+ *
+ * It manages all the possible entry points for DevTools:
+ * - Handles command line arguments like -jsconsole,
+ * - Register all key shortcuts,
+ * - Listen for "Browser Tools" system menu opening, under "Tools",
+ * - Inject the wrench icon in toolbar customization, which is used
+ *   by the "Browser Tools" list displayed in the hamburger menu,
+ * - Register the JSON Viewer protocol handler.
+ * - Inject the profiler recording button in toolbar customization.
+ *
+ * Only once any of these entry point is fired, this module ensures starting
+ * core modules like 'devtools-browser.js' that hooks the browser windows
+ * and ensure setting up tools.
+ **/
+
+const kDebuggerPrefs = [
+  "devtools.debugger.remote-enabled",
+  "devtools.chrome.enabled",
+];
+
+const DEVTOOLS_POLICY_DISABLED_PREF = "devtools.policy.disabled";
+
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+
+import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";
+
+const lazy = {};
+ChromeUtils.defineESModuleGetters(lazy, {
+  CustomizableUI: "resource:///modules/CustomizableUI.sys.mjs",
+  CustomizableWidgets: "resource:///modules/CustomizableWidgets.sys.mjs",
+  PanelMultiView: "resource:///modules/PanelMultiView.sys.mjs",
+  PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.sys.mjs",
+  WebChannel: "resource://gre/modules/WebChannel.sys.mjs",
+});
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "ProfilerMenuButton",
+  "resource://devtools/client/performance-new/popup/menu-button.jsm.js"
+);
+
+// We don't want to spend time initializing the full loader here so we create
+// our own lazy require.
+XPCOMUtils.defineLazyGetter(lazy, "Telemetry", function () {
+  const { require } = ChromeUtils.importESModule(
+    "resource://devtools/shared/loader/Loader.sys.mjs"
+  );
+  // eslint-disable-next-line no-shadow
+  const Telemetry = require("devtools/client/shared/telemetry");
+
+  return Telemetry;
+});
+
+XPCOMUtils.defineLazyGetter(lazy, "KeyShortcutsBundle", function () {
+  return new Localization(["devtools/startup/key-shortcuts.ftl"], true);
+});
+
+/**
+ * Safely retrieve a localized DevTools key shortcut from KeyShortcutsBundle.
+ * If the shortcut is not available, this will return null. Consumer code
+ * should rely on this to skip unavailable shortcuts.
+ *
+ * Note that all shortcuts should always be available, but there is a notable
+ * exception, which is why we have to do this. When a localization change is
+ * uplifted to beta, language packs will not be updated immediately when the
+ * updated beta is available.
+ *
+ * This means that language pack users might get a new Beta version but will not
+ * have a language pack with the new strings yet.
+ */
+function getLocalizedKeyShortcut(id) {
+  try {
+    return lazy.KeyShortcutsBundle.formatValueSync(id);
+  } catch (e) {
+    console.error("Failed to retrieve DevTools localized shortcut for id", id);
+    return null;
+  }
+}
+
+XPCOMUtils.defineLazyGetter(lazy, "KeyShortcuts", function () {
+  const isMac = AppConstants.platform == "macosx";
+
+  // Common modifier shared by most key shortcuts
+  const modifiers = isMac ? "accel,alt" : "accel,shift";
+
+  // List of all key shortcuts triggering installation UI
+  // `id` should match tool's id from client/definitions.js
+  const shortcuts = [
+    // The following keys are also registered in /client/menus.js
+    // And should be synced.
+
+    // Both are toggling the toolbox on the last selected panel
+    // or the default one.
+    {
+      id: "toggleToolbox",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-toggle-toolbox"),
+      modifiers,
+    },
+    // All locales are using F12
+    {
+      id: "toggleToolboxF12",
+      shortcut: getLocalizedKeyShortcut(
+        "devtools-commandkey-toggle-toolbox-f12"
+      ),
+      modifiers: "", // F12 is the only one without modifiers
+    },
+    // Open the Browser Toolbox
+    {
+      id: "browserToolbox",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-browser-toolbox"),
+      modifiers: "accel,alt,shift",
+    },
+    // Open the Browser Console
+    {
+      id: "browserConsole",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-browser-console"),
+      modifiers: "accel,shift",
+    },
+    // Toggle the Responsive Design Mode
+    {
+      id: "responsiveDesignMode",
+      shortcut: getLocalizedKeyShortcut(
+        "devtools-commandkey-responsive-design-mode"
+      ),
+      modifiers,
+    },
+    // The following keys are also registered in /client/definitions.js
+    // and should be synced.
+
+    // Key for opening the Inspector
+    {
+      toolId: "inspector",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-inspector"),
+      modifiers,
+    },
+    // Key for opening the Web Console
+    {
+      toolId: "webconsole",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-webconsole"),
+      modifiers,
+    },
+    // Key for opening the Debugger
+    {
+      toolId: "jsdebugger",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-jsdebugger"),
+      modifiers,
+    },
+    // Key for opening the Network Monitor
+    {
+      toolId: "netmonitor",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-netmonitor"),
+      modifiers,
+    },
+    // Key for opening the Style Editor
+    {
+      toolId: "styleeditor",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-styleeditor"),
+      modifiers: "shift",
+    },
+    // Key for opening the Performance Panel
+    {
+      toolId: "performance",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-performance"),
+      modifiers: "shift",
+    },
+    // Key for opening the Storage Panel
+    {
+      toolId: "storage",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-storage"),
+      modifiers: "shift",
+    },
+    // Key for opening the DOM Panel
+    {
+      toolId: "dom",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-dom"),
+      modifiers,
+    },
+    // Key for opening the Accessibility Panel
+    {
+      toolId: "accessibility",
+      shortcut: getLocalizedKeyShortcut(
+        "devtools-commandkey-accessibility-f12"
+      ),
+      modifiers: "shift",
+    },
+  ];
+
+  if (isMac) {
+    // Add the extra key command for macOS, so you can open the inspector with cmd+shift+C
+    // like on Chrome DevTools.
+    shortcuts.push({
+      id: "inspectorMac",
+      toolId: "inspector",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-inspector"),
+      modifiers: "accel,shift",
+    });
+  }
+
+  if (lazy.ProfilerMenuButton.isInNavbar()) {
+    shortcuts.push(...getProfilerKeyShortcuts());
+  }
+
+  // Allow toggling the JavaScript tracing not only from DevTools UI,
+  // but also from the web page when it is focused.
+  if (
+    Services.prefs.getBoolPref(
+      "devtools.debugger.features.javascript-tracing",
+      false
+    )
+  ) {
+    shortcuts.push({
+      id: "javascriptTracingToggle",
+      shortcut: getLocalizedKeyShortcut(
+        "devtools-commandkey-javascript-tracing-toggle"
+      ),
+      modifiers: "control,shift",
+    });
+  }
+
+  return shortcuts;
+});
+
+function getProfilerKeyShortcuts() {
+  return [
+    // Start/stop the profiler
+    {
+      id: "profilerStartStop",
+      shortcut: getLocalizedKeyShortcut(
+        "devtools-commandkey-profiler-start-stop"
+      ),
+      modifiers: "control,shift",
+    },
+    // Capture a profile
+    {
+      id: "profilerCapture",
+      shortcut: getLocalizedKeyShortcut("devtools-commandkey-profiler-capture"),
+      modifiers: "control,shift",
+    },
+  ];
+}
+
+/**
+ * Validate the URL that will be used for the WebChannel for the profiler.
+ *
+ * @param {string} targetUrl
+ * @returns {string}
+ */
+export function validateProfilerWebChannelUrl(targetUrl) {
+  const frontEndUrl = "https://profiler.firefox.com";
+
+  if (targetUrl !== frontEndUrl) {
+    // The user can specify either localhost or deploy previews as well as
+    // the official frontend URL for testing.
+    if (
+      // Allow a test URL.
+      /^https?:\/\/example\.com$/.test(targetUrl) ||
+      // Allows the following:
+      //   "http://localhost:4242"
+      //   "http://localhost:4242/"
+      //   "http://localhost:3"
+      //   "http://localhost:334798455"
+      /^http:\/\/localhost:\d+\/?$/.test(targetUrl) ||
+      // Allows the following:
+      //   "https://deploy-preview-1234--perf-html.netlify.com"
+      //   "https://deploy-preview-1234--perf-html.netlify.com/"
+      //   "https://deploy-preview-1234567--perf-html.netlify.app"
+      //   "https://main--perf-html.netlify.app"
+      /^https:\/\/(?:deploy-preview-\d+|main)--perf-html\.netlify\.(?:com|app)\/?$/.test(
+        targetUrl
+      )
+    ) {
+      // This URL is one of the allowed ones to be used for configuration.
+      return targetUrl;
+    }
+
+    console.error(
+      `The preference "devtools.performance.recording.ui-base-url" was set to a ` +
+        "URL that is not allowed. No WebChannel messages will be sent between the " +
+        `browser and that URL. Falling back to ${frontEndUrl}. Only localhost ` +
+        "and deploy previews URLs are allowed.",
+      targetUrl
+    );
+  }
+
+  return frontEndUrl;
+}
+
+XPCOMUtils.defineLazyGetter(lazy, "ProfilerPopupBackground", function () {
+  return ChromeUtils.import(
+    "resource://devtools/client/performance-new/shared/background.jsm.js"
+  );
+});
+
+export function DevToolsStartup() {
+  this.onWindowReady = this.onWindowReady.bind(this);
+  this.addDevToolsItemsToSubview = this.addDevToolsItemsToSubview.bind(this);
+  this.onMoreToolsViewShowing = this.onMoreToolsViewShowing.bind(this);
+  this.toggleProfilerKeyShortcuts = this.toggleProfilerKeyShortcuts.bind(this);
+}
+
+DevToolsStartup.prototype = {
+  /**
+   * Boolean flag to check if DevTools have been already initialized or not.
+   * By initialized, we mean that its main modules are loaded.
+   */
+  initialized: false,
+
+  /**
+   * Boolean flag to check if the devtools initialization was already sent to telemetry.
+   * We only want to record one devtools entry point per Firefox run, but we are not
+   * interested in all the entry points.
+   */
+  recorded: false,
+
+  get telemetry() {
+    if (!this._telemetry) {
+      this._telemetry = new lazy.Telemetry();
+      this._telemetry.setEventRecordingEnabled(true);
+    }
+    return this._telemetry;
+  },
+
+  /**
+   * Flag that indicates if the developer toggle was already added to customizableUI.
+   */
+  developerToggleCreated: false,
+
+  /**
+   * Flag that indicates if the profiler recording popup was already added to
+   * customizableUI.
+   */
+  profilerRecordingButtonCreated: false,
+
+  isDisabledByPolicy() {
+    return Services.prefs.getBoolPref(DEVTOOLS_POLICY_DISABLED_PREF, false);
+  },
+
+  handle(cmdLine) {
+    const flags = this.readCommandLineFlags(cmdLine);
+
+    // handle() can be called after browser startup (e.g. opening links from other apps).
+    const isInitialLaunch =
+      cmdLine.state == Ci.nsICommandLine.STATE_INITIAL_LAUNCH;
+    if (isInitialLaunch) {
+      // Store devtoolsFlag to check it later in onWindowReady.
+      this.devtoolsFlag = flags.devtools;
+
+      /* eslint-disable mozilla/balanced-observers */
+      // We are not expecting to remove those listeners until Firefox closes.
+
+      // Only top level Firefox Windows fire a browser-delayed-startup-finished event
+      Services.obs.addObserver(
+        this.onWindowReady,
+        "browser-delayed-startup-finished"
+      );
+
+      // Add DevTools menu items to the "More Tools" view.
+      Services.obs.addObserver(
+        this.onMoreToolsViewShowing,
+        "web-developer-tools-view-showing"
+      );
+      /* eslint-enable mozilla/balanced-observers */
+
+      if (!this.isDisabledByPolicy()) {
+        if (AppConstants.MOZ_DEV_EDITION) {
+          // On DevEdition, the developer toggle is displayed by default in the navbar
+          // area and should be created before the first paint.
+          this.hookDeveloperToggle();
+        }
+
+        this.hookProfilerRecordingButton();
+      }
+    }
+
+    if (flags.console) {
+      this.commandLine = true;
+      this.handleConsoleFlag(cmdLine);
+    }
+    if (flags.debugger) {
+      this.commandLine = true;
+      const binaryPath =
+        typeof flags.debugger == "string" ? flags.debugger : null;
+      this.handleDebuggerFlag(cmdLine, binaryPath);
+    }
+
+    if (flags.devToolsServer) {
+      this.handleDevToolsServerFlag(cmdLine, flags.devToolsServer);
+    }
+
+    // If Firefox is already opened, and DevTools are also already opened,
+    // try to open links passed via command line arguments.
+    if (!isInitialLaunch && this.initialized && cmdLine.length) {
+      this.checkForDebuggerLink(cmdLine);
+    }
+  },
+
+  /**
+   * Lookup in all arguments passed to firefox binary to find
+   * URLs including a precise location, like this:
+   *   https://domain.com/file.js:1:10 (URL ending with `:${line}:${number}`)
+   * When such argument exists, try to open this source and precise location
+   * in the debugger.
+   *
+   * @param {nsICommandLine} cmdLine
+   */
+  checkForDebuggerLink(cmdLine) {
+    const urlFlagIdx = cmdLine.findFlag("url", false);
+    // Bail out when there is no -url argument, or if that's last and so there is no URL after it.
+    if (urlFlagIdx == -1 && urlFlagIdx + 1 < cmdLine.length) {
+      return;
+    }
+
+    // The following code would only work if we have a top level browser window opened
+    const window = Services.wm.getMostRecentWindow("navigator:browser");
+    if (!window) {
+      return;
+    }
+
+    const urlParam = cmdLine.getArgument(urlFlagIdx + 1);
+
+    // Avoid processing valid url like:
+    //   http://foo@user:123
+    // Note that when loading `http://foo.com` the URL of the default html page will be `http://foo.com/`.
+    // So that there will always be another `/` after `https://`
+    if (
+      (urlParam.startsWith("http://") || urlParam.startsWith("https://")) &&
+      urlParam.lastIndexOf("/") <= 7
+    ) {
+      return;
+    }
+
+    let match = urlParam.match(/^(?<url>\w+:.+):(?<line>\d+):(?<column>\d+)$/);
+    if (!match) {
+      // fallback on only having the line when there is no column
+      match = urlParam.match(/^(?<url>\w+:.+):(?<line>\d+)?$/);
+      if (!match) {
+        return;
+      }
+    }
+
+    const { url, line, column } = match.groups;
+
+    // If for any reason the final url is invalid, ignore it
+    try {
+      Services.io.newURI(url);
+    } catch (e) {
+      return;
+    }
+
+    // Avoid regular Firefox code from processing this argument,
+    // otherwise we would open the source in DevTools and in a new tab.
+    //
+    // /!\ This has to be called synchronously from the call to `DevToolsStartup.handle(cmdLine)`
+    //     Otherwise the next command lines listener will interpret the argument redundantly.
+    cmdLine.removeArguments(urlFlagIdx, urlFlagIdx + 1);
+
+    // Avoid opening a new empty top level window if there is no more arguments
+    if (!cmdLine.length) {
+      cmdLine.preventDefault = true;
+    }
+
+    // Note that the following method is async and returns a promise.
+    // But the current method has to be synchronous because of cmdLine.removeArguments.
+    this.openSourceInDebugger(window, {
+      url,
+      line: parseInt(line, 10),
+      column: parseInt(column || 0, 10),
+    });
+  },
+
+  /**
+   * If DevTools and the debugger are opened, try to open the source
+   * at specified location in the debugger.
+   * Otherwise fallback by opening this location via view-source.
+   *
+   * @param {Window} window
+   *        The top level browser window into which we should open the URL.
+   * @param {String} url
+   * @param {Number} line
+   * @param {Number} column
+   */
+  async openSourceInDebugger(window, { url, line, column }) {
+    const require = this.initDevTools("CommandLine");
+    const { gDevTools } = require("devtools/client/framework/devtools");
+    await gDevTools.openSourceInDebugger(window, { url, line, column });
+  },
+
+  readCommandLineFlags(cmdLine) {
+    // All command line flags are disabled if DevTools are disabled by policy.
+    if (this.isDisabledByPolicy()) {
+      return {
+        console: false,
+        debugger: false,
+        devtools: false,
+        devToolsServer: false,
+      };
+    }
+
+    const console = cmdLine.handleFlag("jsconsole", false);
+    const devtools = cmdLine.handleFlag("devtools", false);
+
+    let devToolsServer;
+    try {
+      devToolsServer = cmdLine.handleFlagWithParam(
+        "start-debugger-server",
+        false
+      );
+    } catch (e) {
+      // We get an error if the option is given but not followed by a value.
+      // By catching and trying again, the value is effectively optional.
+      devToolsServer = cmdLine.handleFlag("start-debugger-server", false);
+    }
+
+    let debuggerFlag;
+    try {
+      debuggerFlag = cmdLine.handleFlagWithParam("jsdebugger", false);
+    } catch (e) {
+      // We get an error if the option is given but not followed by a value.
+      // By catching and trying again, the value is effectively optional.
+      debuggerFlag = cmdLine.handleFlag("jsdebugger", false);
+    }
+
+    return { console, debugger: debuggerFlag, devtools, devToolsServer };
+  },
+
+  /**
+   * Called when receiving the "browser-delayed-startup-finished" event for a new
+   * top-level window.
+   */
+  onWindowReady(window) {
+    if (
+      this.isDisabledByPolicy() ||
+      AppConstants.MOZ_APP_NAME == "thunderbird"
+    ) {
+      return;
+    }
+
+    this.hookWindow(window);
+
+    // This listener is called for all Firefox windows, but we want to execute some code
+    // only once.
+    if (!this._firstWindowReadyReceived) {
+      this.onFirstWindowReady(window);
+      this._firstWindowReadyReceived = true;
+    }
+
+    JsonView.initialize();
+  },
+
+  onFirstWindowReady(window) {
+    if (this.devtoolsFlag) {
+      this.handleDevToolsFlag(window);
+
+      // In the case of the --jsconsole and --jsdebugger command line parameters
+      // there was no browser window when they were processed so we act on the
+      // this.commandline flag instead.
+      if (this.commandLine) {
+        this.sendEntryPointTelemetry("CommandLine");
+      }
+    }
+    this.setSlowScriptDebugHandler();
+  },
+
+  /**
+   * Register listeners to all possible entry points for Developer Tools.
+   * But instead of implementing the actual actions, defer to DevTools codebase.
+   * In most cases, it only needs to call this.initDevTools which handles the rest.
+   * We do that to prevent loading any DevTools module until the user intent to use them.
+   */
+  hookWindow(window) {
+    // Key Shortcuts need to be added on all the created windows.
+    this.hookKeyShortcuts(window);
+
+    // In some situations (e.g. starting Firefox with --jsconsole) DevTools will be
+    // initialized before the first browser-delayed-startup-finished event is received.
+    // We use a dedicated flag because we still need to hook the developer toggle.
+    this.hookDeveloperToggle();
+    this.hookProfilerRecordingButton();
+
+    // The developer menu hook only needs to be added if devtools have not been
+    // initialized yet.
+    if (!this.initialized) {
+      this.hookBrowserToolsMenu(window);
+    }
+  },
+
+  /**
+   * Dynamically register a wrench icon in the customization menu.
+   * You can use this button by right clicking on Firefox toolbar
+   * and dragging it from the customization panel to the toolbar.
+   * (i.e. this isn't displayed by default to users!)
+   *
+   * _But_, the "Browser Tools" entry in the hamburger menu (the menu with
+   * 3 horizontal lines), is using this "developer-button" view to populate
+   * its menu. So we have to register this button for the menu to work.
+   *
+   * Also, this menu duplicates its own entries from the "Browser Tools"
+   * menu in the system menu, under "Tools" main menu item. The system
+   * menu is being hooked by "hookBrowserToolsMenu" which ends up calling
+   * devtools/client/framework/browser-menus to create the items for real,
+   * initDevTools, from onViewShowing is also calling browser-menu.
+   */
+  hookDeveloperToggle() {
+    if (this.developerToggleCreated) {
+      return;
+    }
+
+    const id = "developer-button";
+    const widget = lazy.CustomizableUI.getWidget(id);
+    if (widget && widget.provider == lazy.CustomizableUI.PROVIDER_API) {
+      return;
+    }
+
+    const panelviewId = "PanelUI-developer-tools";
+    const subviewId = "PanelUI-developer-tools-view";
+
+    const item = {
+      id,
+      type: "view",
+      viewId: panelviewId,
+      shortcutId: "key_toggleToolbox",
+      tooltiptext: "developer-button.tooltiptext2",
+      onViewShowing: event => {
+        const doc = event.target.ownerDocument;
+        const developerItems = lazy.PanelMultiView.getViewNode(doc, subviewId);
+        this.addDevToolsItemsToSubview(developerItems);
+      },
+      onInit(anchor) {
+        // Since onBeforeCreated already bails out when initialized, we can call
+        // it right away.
+        this.onBeforeCreated(anchor.ownerDocument);
+      },
+      onBeforeCreated: doc => {
+        // The developer toggle needs the "key_toggleToolbox" <key> element.
+        // In DEV EDITION, the toggle is added before 1st paint and hookKeyShortcuts() is
+        // not called yet when CustomizableUI creates the widget.
+        this.hookKeyShortcuts(doc.defaultView);
+      },
+    };
+    lazy.CustomizableUI.createWidget(item);
+    lazy.CustomizableWidgets.push(item);
+
+    this.developerToggleCreated = true;
+  },
+
+  addDevToolsItemsToSubview(subview) {
+    // Initialize DevTools to create all menuitems in the system menu before
+    // trying to copy them.
+    this.initDevTools("HamburgerMenu");
+
+    // Populate the subview with whatever menuitems are in the developer
+    // menu. We skip menu elements, because the menu panel has no way
+    // of dealing with those right now.
+    const doc = subview.ownerDocument;
+    const menu = doc.getElementById("menuWebDeveloperPopup");
+    const itemsToDisplay = [...menu.children];
+
+    lazy.CustomizableUI.clearSubview(subview);
+    lazy.CustomizableUI.fillSubviewFromMenuItems(itemsToDisplay, subview);
+  },
+
+  onMoreToolsViewShowing(moreToolsView) {
+    this.addDevToolsItemsToSubview(moreToolsView);
+  },
+
+  /**
+   * Register the profiler recording button. This button will be available
+   * in the customization palette for the Firefox toolbar. In addition, it can be
+   * enabled from profiler.firefox.com.
+   */
+  hookProfilerRecordingButton() {
+    if (this.profilerRecordingButtonCreated) {
+      return;
+    }
+    const featureFlagPref = "devtools.performance.popup.feature-flag";
+    const isPopupFeatureFlagEnabled =
+      Services.prefs.getBoolPref(featureFlagPref);
+    this.profilerRecordingButtonCreated = true;
+
+    // Listen for messages from the front-end. This needs to happen even if the
+    // button isn't enabled yet. This will allow the front-end to turn on the
+    // popup for our users, regardless of if the feature is enabled by default.
+    this.initializeProfilerWebChannel();
+
+    if (isPopupFeatureFlagEnabled) {
+      // Initialize the CustomizableUI widget.
+      lazy.ProfilerMenuButton.initialize(this.toggleProfilerKeyShortcuts);
+    } else {
+      // The feature flag is not enabled, but watch for it to be enabled. If it is,
+      // initialize everything.
+      const enable = () => {
+        lazy.ProfilerMenuButton.initialize(this.toggleProfilerKeyShortcuts);
+        Services.prefs.removeObserver(featureFlagPref, enable);
+      };
+      Services.prefs.addObserver(featureFlagPref, enable);
+    }
+  },
+
+  /**
+   * Initialize the WebChannel for profiler.firefox.com. This function happens at
+   * startup, so care should be taken to minimize its performance impact. The WebChannel
+   * is a mechanism that is used to communicate between the browser, and front-end code.
+   */
+  initializeProfilerWebChannel() {
+    let channel;
+
+    // Register a channel for the URL in preferences. Also update the WebChannel if
+    // the URL changes.
+    const urlPref = "devtools.performance.recording.ui-base-url";
+
+    // This method is only run once per Firefox instance, so it should not be
+    // strictly necessary to remove observers here.
+    // eslint-disable-next-line mozilla/balanced-observers
+    Services.prefs.addObserver(urlPref, registerWebChannel);
+
+    registerWebChannel();
+
+    function registerWebChannel() {
+      if (channel) {
+        channel.stopListening();
+      }
+
+      const urlForWebChannel = Services.io.newURI(
+        validateProfilerWebChannelUrl(Services.prefs.getStringPref(urlPref))
+      );
+
+      channel = new lazy.WebChannel("profiler.firefox.com", urlForWebChannel);
+
+      channel.listen((id, message, target) => {
+        // Defer loading the ProfilerPopupBackground script until it's absolutely needed,
+        // as this code path gets loaded at startup.
+        lazy.ProfilerPopupBackground.handleWebChannelMessage(
+          channel,
+          id,
+          message,
+          target
+        );
+      });
+    }
+  },
+
+  /*
+   * We listen to the "Browser Tools" system menu, which is under "Tools" main item.
+   * This menu item is hardcoded empty in Firefox UI. We listen for its opening to
+   * populate it lazily. Loading main DevTools module is going to populate it.
+   */
+  hookBrowserToolsMenu(window) {
+    const menu = window.document.getElementById("browserToolsMenu");
+    const onPopupShowing = () => {
+      menu.removeEventListener("popupshowing", onPopupShowing);
+      this.initDevTools("SystemMenu");
+    };
+    menu.addEventListener("popupshowing", onPopupShowing);
+  },
+
+  /**
+   * Check if the user is a DevTools user by looking at our selfxss pref.
+   * This preference is incremented everytime the console is used (up to 5).
+   *
+   * @return {Boolean} true if the user can be considered as a devtools user.
+   */
+  isDevToolsUser() {
+    const selfXssCount = Services.prefs.getIntPref("devtools.selfxss.count", 0);
+    return selfXssCount > 0;
+  },
+
+  hookKeyShortcuts(window) {
+    const doc = window.document;
+
+    // hookKeyShortcuts can be called both from hookWindow and from the developer toggle
+    // onBeforeCreated. Make sure shortcuts are only added once per window.
+    if (doc.getElementById("devtoolsKeyset")) {
+      return;
+    }
+
+    const keyset = doc.createXULElement("keyset");
+    keyset.setAttribute("id", "devtoolsKeyset");
+
+    this.attachKeys(doc, lazy.KeyShortcuts, keyset);
+
+    // Appending a <key> element is not always enough. The <keyset> needs
+    // to be detached and reattached to make sure the <key> is taken into
+    // account (see bug 832984).
+    const mainKeyset = doc.getElementById("mainKeyset");
+    mainKeyset.parentNode.insertBefore(keyset, mainKeyset);
+  },
+
+  /**
+   * This method attaches on the key elements to the devtools keyset.
+   */
+  attachKeys(doc, keyShortcuts, keyset = doc.getElementById("devtoolsKeyset")) {
+    const window = doc.defaultView;
+    for (const key of keyShortcuts) {
+      if (!key.shortcut) {
+        // Shortcuts might be missing when a user relies on a language packs
+        // which is missing a recently uplifted shortcut. Language packs are
+        // typically updated a few days after a code uplift.
+        continue;
+      }
+      const xulKey = this.createKey(doc, key, () => this.onKey(window, key));
+      keyset.appendChild(xulKey);
+    }
+  },
+
+  /**
+   * This method removes keys from the devtools keyset.
+   */
+  removeKeys(doc, keyShortcuts) {
+    for (const key of keyShortcuts) {
+      const keyElement = doc.getElementById(this.getKeyElementId(key));
+      if (keyElement) {
+        keyElement.remove();
+      }
+    }
+  },
+
+  /**
+   * We only want to have the keyboard shortcuts active when the menu button is on.
+   * This function either adds or removes the elements.
+   * @param {boolean} isEnabled
+   */
+  toggleProfilerKeyShortcuts(isEnabled) {
+    const profilerKeyShortcuts = getProfilerKeyShortcuts();
+    for (const { document } of Services.wm.getEnumerator(null)) {
+      const devtoolsKeyset = document.getElementById("devtoolsKeyset");
+      const mainKeyset = document.getElementById("mainKeyset");
+
+      if (!devtoolsKeyset || !mainKeyset) {
+        // There may not be devtools keyset on this window.
+        continue;
+      }
+
+      const areProfilerKeysPresent = !!document.getElementById(
+        "key_profilerStartStop"
+      );
+      if (isEnabled === areProfilerKeysPresent) {
+        // Don't double add or double remove the shortcuts.
+        continue;
+      }
+      if (isEnabled) {
+        this.attachKeys(document, profilerKeyShortcuts);
+      } else {
+        this.removeKeys(document, profilerKeyShortcuts);
+      }
+      // Appending a <key> element is not always enough. The <keyset> needs
+      // to be detached and reattached to make sure the <key> is taken into
+      // account (see bug 832984).
+      mainKeyset.parentNode.insertBefore(devtoolsKeyset, mainKeyset);
+    }
+  },
+
+  async onKey(window, key) {
+    try {
+      // The profiler doesn't care if DevTools is loaded, so provide a quick check
+      // first to bail out of checking if DevTools is available.
+      switch (key.id) {
+        case "profilerStartStop": {
+          lazy.ProfilerPopupBackground.toggleProfiler("aboutprofiling");
+          return;
+        }
+        case "profilerCapture": {
+          lazy.ProfilerPopupBackground.captureProfile("aboutprofiling");
+          return;
+        }
+      }
+
+      // Ignore the following key shortcut if DevTools aren't yet opened.
+      // The key shortcut is registered in this core component in order to
+      // work even when the web page is focused.
+      if (key.id == "javascriptTracingToggle" && !this.initialized) {
+        return;
+      }
+
+      // Record the timing at which this event started in order to compute later in
+      // gDevTools.showToolbox, the complete time it takes to open the toolbox.
+      // i.e. especially take `initDevTools` into account.
+      const startTime = Cu.now();
+      const require = this.initDevTools("KeyShortcut", key);
+      const {
+        gDevToolsBrowser,
+      } = require("devtools/client/framework/devtools-browser");
+      await gDevToolsBrowser.onKeyShortcut(window, key, startTime);
+    } catch (e) {
+      console.error(`Exception while trigerring key ${key}: ${e}\n${e.stack}`);
+    }
+  },
+
+  getKeyElementId({ id, toolId }) {
+    return "key_" + (id || toolId);
+  },
+
+  // Create a <xul:key> DOM Element
+  createKey(doc, key, oncommand) {
+    const { shortcut, modifiers: mod } = key;
+    const k = doc.createXULElement("key");
+    k.id = this.getKeyElementId(key);
+
+    if (shortcut.startsWith("VK_")) {
+      k.setAttribute("keycode", shortcut);
+      if (shortcut.match(/^VK_\d$/)) {
+        // Add the event keydown attribute to ensure that shortcuts work for combinations
+        // such as ctrl shift 1.
+        k.setAttribute("event", "keydown");
+      }
+    } else {
+      k.setAttribute("key", shortcut);
+    }
+
+    if (mod) {
+      k.setAttribute("modifiers", mod);
+    }
+
+    k.addEventListener("command", oncommand);
+
+    return k;
+  },
+
+  initDevTools(reason, key = "") {
+    // In the case of the --jsconsole and --jsdebugger command line parameters
+    // there is no browser window yet so we don't send any telemetry yet.
+    if (reason !== "CommandLine") {
+      this.sendEntryPointTelemetry(reason, key);
+    }
+
+    this.initialized = true;
+    const { require } = ChromeUtils.importESModule(
+      "resource://devtools/shared/loader/Loader.sys.mjs"
+    );
+    // Ensure loading main devtools module that hooks up into browser UI
+    // and initialize all devtools machinery.
+    // eslint-disable-next-line import/no-unassigned-import
+    require("devtools/client/framework/devtools-browser");
+    return require;
+  },
+
+  handleConsoleFlag(cmdLine) {
+    const window = Services.wm.getMostRecentWindow("devtools:webconsole");
+    if (!window) {
+      const require = this.initDevTools("CommandLine");
+      const {
+        BrowserConsoleManager,
+      } = require("devtools/client/webconsole/browser-console-manager");
+      BrowserConsoleManager.toggleBrowserConsole().catch(console.error);
+    } else {
+      // the Browser Console was already open
+      window.focus();
+    }
+
+    if (cmdLine.state == Ci.nsICommandLine.STATE_REMOTE_AUTO) {
+      cmdLine.preventDefault = true;
+    }
+  },
+
+  // Open the toolbox on the selected tab once the browser starts up.
+  async handleDevToolsFlag(window) {
+    const require = this.initDevTools("CommandLine");
+    const { gDevTools } = require("devtools/client/framework/devtools");
+    await gDevTools.showToolboxForTab(window.gBrowser.selectedTab);
+  },
+
+  _isRemoteDebuggingEnabled() {
+    let remoteDebuggingEnabled = false;
+    try {
+      remoteDebuggingEnabled = kDebuggerPrefs.every(pref => {
+        return Services.prefs.getBoolPref(pref);
+      });
+    } catch (ex) {
+      console.error(ex);
+      return false;
+    }
+    if (!remoteDebuggingEnabled) {
+      const errorMsg =
+        "Could not run chrome debugger! You need the following " +
+        "prefs to be set to true: " +
+        kDebuggerPrefs.join(", ");
+      console.error(new Error(errorMsg));
+      // Dump as well, as we're doing this from a commandline, make sure people
+      // don't miss it:
+      dump(errorMsg + "\n");
+    }
+    return remoteDebuggingEnabled;
+  },
+
+  handleDebuggerFlag(cmdLine, binaryPath) {
+    if (!this._isRemoteDebuggingEnabled()) {
+      return;
+    }
+
+    let devtoolsThreadResumed = false;
+    const pauseOnStartup = cmdLine.handleFlag("wait-for-jsdebugger", false);
+    if (pauseOnStartup) {
+      const observe = function (subject, topic, data) {
+        devtoolsThreadResumed = true;
+        Services.obs.removeObserver(observe, "devtools-thread-ready");
+      };
+      Services.obs.addObserver(observe, "devtools-thread-ready");
+    }
+
+    const { BrowserToolboxLauncher } = ChromeUtils.importESModule(
+      "resource://devtools/client/framework/browser-toolbox/Launcher.sys.mjs"
+    );
+    // --jsdebugger $binaryPath is an helper alias to set MOZ_BROWSER_TOOLBOX_BINARY=$binaryPath
+    // See comment within BrowserToolboxLauncher.
+    // Setting it as an environment variable helps it being reused if we restart the browser via CmdOrCtrl+R
+    Services.env.set("MOZ_BROWSER_TOOLBOX_BINARY", binaryPath);
+
+    const browserToolboxLauncherConfig = {};
+
+    // If user passed the --jsdebugger in mochitests, we want to enable the
+    // multiprocess Browser Toolbox (by default it's parent process only)
+    if (Services.prefs.getBoolPref("devtools.testing", false)) {
+      browserToolboxLauncherConfig.forceMultiprocess = true;
+    }
+    BrowserToolboxLauncher.init(browserToolboxLauncherConfig);
+
+    if (pauseOnStartup) {
+      // Spin the event loop until the debugger connects.
+      const tm = Cc["@mozilla.org/thread-manager;1"].getService();
+      tm.spinEventLoopUntil("DevToolsStartup.jsm:handleDebuggerFlag", () => {
+        return devtoolsThreadResumed;
+      });
+    }
+
+    if (cmdLine.state == Ci.nsICommandLine.STATE_REMOTE_AUTO) {
+      cmdLine.preventDefault = true;
+    }
+  },
+
+  /**
+   * Handle the --start-debugger-server command line flag. The options are:
+   * --start-debugger-server
+   *   The portOrPath parameter is boolean true in this case. Reads and uses the defaults
+   *   from devtools.debugger.remote-port and devtools.debugger.remote-websocket prefs.
+   *   The default values of these prefs are port 6000, WebSocket disabled.
+   *
+   * --start-debugger-server 6789
+   *   Start the non-WebSocket server on port 6789.
+   *
+   * --start-debugger-server /path/to/filename
+   *   Start the server on a Unix domain socket.
+   *
+   * --start-debugger-server ws:6789
+   *   Start the WebSocket server on port 6789.
+   *
+   * --start-debugger-server ws:
+   *   Start the WebSocket server on the default port (taken from d.d.remote-port)
+   */
+  handleDevToolsServerFlag(cmdLine, portOrPath) {
+    if (!this._isRemoteDebuggingEnabled()) {
+      return;
+    }
+
+    let webSocket = false;
+    const defaultPort = Services.prefs.getIntPref(
+      "devtools.debugger.remote-port"
+    );
+    if (portOrPath === true) {
+      // Default to pref values if no values given on command line
+      webSocket = Services.prefs.getBoolPref(
+        "devtools.debugger.remote-websocket"
+      );
+      portOrPath = defaultPort;
+    } else if (portOrPath.startsWith("ws:")) {
+      webSocket = true;
+      const port = portOrPath.slice(3);
+      portOrPath = Number(port) ? port : defaultPort;
+    }
+
+    const {
+      useDistinctSystemPrincipalLoader,
+      releaseDistinctSystemPrincipalLoader,
+    } = ChromeUtils.importESModule(
+      "resource://devtools/shared/loader/DistinctSystemPrincipalLoader.sys.mjs"
+    );
+
+    try {
+      // Create a separate loader instance, so that we can be sure to receive
+      // a separate instance of the DebuggingServer from the rest of the
+      // devtools.  This allows us to safely use the tools against even the
+      // actors and DebuggingServer itself, especially since we can mark
+      // serverLoader as invisible to the debugger (unlike the usual loader
+      // settings).
+      const serverLoader = useDistinctSystemPrincipalLoader(this);
+      const { DevToolsServer: devToolsServer } = serverLoader.require(
+        "resource://devtools/server/devtools-server.js"
+      );
+      const { SocketListener } = serverLoader.require(
+        "resource://devtools/shared/security/socket.js"
+      );
+      devToolsServer.init();
+
+      // Force the server to be kept running when the last connection closes.
+      // So that another client can connect after the previous one is disconnected.
+      devToolsServer.keepAlive = true;
+
+      devToolsServer.registerAllActors();
+      devToolsServer.allowChromeProcess = true;
+      const socketOptions = { portOrPath, webSocket };
+
+      const listener = new SocketListener(devToolsServer, socketOptions);
+      listener.open();
+      dump("Started devtools server on " + portOrPath + "\n");
+
+      // Prevent leaks on shutdown.
+      const close = () => {
+        Services.obs.removeObserver(close, "quit-application");
+        dump("Stopped devtools server on " + portOrPath + "\n");
+        if (listener) {
+          listener.close();
+        }
+        if (devToolsServer) {
+          devToolsServer.destroy();
+        }
+        releaseDistinctSystemPrincipalLoader(this);
+      };
+      Services.obs.addObserver(close, "quit-application");
+    } catch (e) {
+      dump("Unable to start devtools server on " + portOrPath + ": " + e);
+    }
+
+    if (cmdLine.state == Ci.nsICommandLine.STATE_REMOTE_AUTO) {
+      cmdLine.preventDefault = true;
+    }
+  },
+
+  /**
+   * Send entry point telemetry explaining how the devtools were launched. This
+   * functionality also lives inside `devtools/client/framework/browser-menus.js`
+   * because this codepath is only used the first time a toolbox is opened for a
+   * tab.
+   *
+   * @param {String} reason
+   *        One of "KeyShortcut", "SystemMenu", "HamburgerMenu", "ContextMenu",
+   *        "CommandLine".
+   * @param {String} key
+   *        The key used by a key shortcut.
+   */
+  sendEntryPointTelemetry(reason, key = "") {
+    if (!reason) {
+      return;
+    }
+
+    let keys = "";
+
+    if (reason === "KeyShortcut") {
+      let { modifiers, shortcut } = key;
+
+      modifiers = modifiers.replace(",", "+");
+
+      if (shortcut.startsWith("VK_")) {
+        shortcut = shortcut.substr(3);
+      }
+
+      keys = `${modifiers}+${shortcut}`;
+    }
+
+    const window = Services.wm.getMostRecentWindow("navigator:browser");
+
+    this.telemetry.addEventProperty(
+      window,
+      "open",
+      "tools",
+      null,
+      "shortcut",
+      keys
+    );
+    this.telemetry.addEventProperty(
+      window,
+      "open",
+      "tools",
+      null,
+      "entrypoint",
+      reason
+    );
+
+    if (this.recorded) {
+      return;
+    }
+
+    // Only save the first call for each firefox run as next call
+    // won't necessarely start the tool. For example key shortcuts may
+    // only change the currently selected tool.
+    try {
+      this.telemetry.getHistogramById("DEVTOOLS_ENTRY_POINT").add(reason);
+    } catch (e) {
+      dump("DevTools telemetry entry point failed: " + e + "\n");
+    }
+    this.recorded = true;
+  },
+
+  /**
+   * Hook the debugger tool to the "Debug Script" button of the slow script dialog.
+   */
+  setSlowScriptDebugHandler() {
+    const debugService = Cc["@mozilla.org/dom/slow-script-debug;1"].getService(
+      Ci.nsISlowScriptDebug
+    );
+
+    debugService.activationHandler = window => {
+      const chromeWindow = window.browsingContext.topChromeWindow;
+
+      let setupFinished = false;
+      this.slowScriptDebugHandler(chromeWindow.gBrowser.selectedTab).then(
+        () => {
+          setupFinished = true;
+        }
+      );
+
+      // Don't return from the interrupt handler until the debugger is brought
+      // up; no reason to continue executing the slow script.
+      const utils = window.windowUtils;
+      utils.enterModalState();
+      Services.tm.spinEventLoopUntil(
+        "devtools-browser.js:debugService.activationHandler",
+        () => {
+          return setupFinished;
+        }
+      );
+      utils.leaveModalState();
+    };
+
+    debugService.remoteActivationHandler = async (browser, callback) => {
+      try {
+        // Force selecting the freezing tab
+        const chromeWindow = browser.ownerGlobal;
+        const tab = chromeWindow.gBrowser.getTabForBrowser(browser);
+        chromeWindow.gBrowser.selectedTab = tab;
+
+        await this.slowScriptDebugHandler(tab);
+      } catch (e) {
+        console.error(e);
+      }
+      callback.finishDebuggerStartup();
+    };
+  },
+
+  /**
+   * Called by setSlowScriptDebugHandler, when a tab freeze because of a slow running script
+   */
+  async slowScriptDebugHandler(tab) {
+    const require = this.initDevTools("SlowScript");
+    const { gDevTools } = require("devtools/client/framework/devtools");
+    const toolbox = await gDevTools.showToolboxForTab(tab, {
+      toolId: "jsdebugger",
+    });
+    const threadFront = toolbox.threadFront;
+
+    // Break in place, which means resuming the debuggee thread and pausing
+    // right before the next step happens.
+    switch (threadFront.state) {
+      case "paused":
+        // When the debugger is already paused.
+        threadFront.resumeThenPause();
+        break;
+      case "attached":
+        // When the debugger is already open.
+        const onPaused = threadFront.once("paused");
+        threadFront.interrupt();
+        await onPaused;
+        threadFront.resumeThenPause();
+        break;
+      case "resuming":
+        // The debugger is newly opened.
+        const onResumed = threadFront.once("resumed");
+        await threadFront.interrupt();
+        await onResumed;
+        threadFront.resumeThenPause();
+        break;
+      default:
+        throw Error(
+          "invalid thread front state in slow script debug handler: " +
+            threadFront.state
+        );
+    }
+  },
+
+  // Used by tests and the toolbox to register the same key shortcuts in toolboxes loaded
+  // in a window window.
+  get KeyShortcuts() {
+    return lazy.KeyShortcuts;
+  },
+  get wrappedJSObject() {
+    return this;
+  },
+
+  get jsdebuggerHelpInfo() {
+    return `  --jsdebugger [<path>] Open the Browser Toolbox. Defaults to the local build
+                     but can be overridden by a firefox path.
+  --wait-for-jsdebugger Spin event loop until JS debugger connects.
+                     Enables debugging (some) application startup code paths.
+                     Only has an effect when \`--jsdebugger\` is also supplied.
+  --start-debugger-server [ws:][ <port> | <path> ] Start the devtools server on
+                     a TCP port or Unix domain socket path. Defaults to TCP port
+                     6000. Use WebSocket protocol if ws: prefix is specified.
+`;
+  },
+
+  get helpInfo() {
+    return `  --jsconsole        Open the Browser Console.
+  --devtools         Open DevTools on initial load.
+${this.jsdebuggerHelpInfo}`;
+  },
+
+  classID: Components.ID("{9e9a9283-0ce9-4e4a-8f1c-ba129a032c32}"),
+  QueryInterface: ChromeUtils.generateQI(["nsICommandLineHandler"]),
+};
+
+/**
+ * Singleton object that represents the JSON View in-content tool.
+ * It has the same lifetime as the browser.
+ */
+const JsonView = {
+  initialized: false,
+
+  initialize() {
+    // Prevent loading the frame script multiple times if we call this more than once.
+    if (this.initialized) {
+      return;
+    }
+    this.initialized = true;
+
+    // Register for messages coming from the child process.
+    // This is never removed as there is no particular need to unregister
+    // it during shutdown.
+    Services.mm.addMessageListener("devtools:jsonview:save", this.onSave);
+  },
+
+  // Message handlers for events from child processes
+
+  /**
+   * Save JSON to a file needs to be implemented here
+   * in the parent process.
+   */
+  onSave(message) {
+    const browser = message.target;
+    const chrome = browser.ownerGlobal;
+    if (message.data === null) {
+      // Save original contents
+      chrome.saveBrowser(browser);
+    } else {
+      if (
+        !message.data.startsWith("blob:null") ||
+        !browser.contentPrincipal.isNullPrincipal
+      ) {
+        console.error("Got invalid request to save JSON data");
+        return;
+      }
+      // The following code emulates saveBrowser, but:
+      // - Uses the given blob URL containing the custom contents to save.
+      // - Obtains the file name from the URL of the document, not the blob.
+      // - avoids passing the document and explicitly passes system principal.
+      //   We have a blob created by a null principal to save, and the null
+      //   principal is from the child. Null principals don't survive crossing
+      //   over IPC, so there's no other principal that'll work.
+      const persistable = browser.frameLoader;
+      persistable.startPersistence(null, {
+        onDocumentReady(doc) {
+          const uri = chrome.makeURI(doc.documentURI, doc.characterSet);
+          const filename = chrome.getDefaultFileName(undefined, uri, doc, null);
+          chrome.internalSave(
+            message.data,
+            null /* originalURL */,
+            null,
+            filename,
+            null,
+            doc.contentType,
+            false /* bypass cache */,
+            null /* filepicker title key */,
+            null /* file chosen */,
+            null /* referrer */,
+            doc.cookieJarSettings,
+            null /* initiating document */,
+            false /* don't skip prompt for a location */,
+            null /* cache key */,
+            lazy.PrivateBrowsingUtils.isBrowserPrivate(
+              browser
+            ) /* private browsing ? */,
+            Services.scriptSecurityManager.getSystemPrincipal()
+          );
+        },
+        onError(status) {
+          throw new Error("JSON Viewer's onSave failed in startPersistence");
+        },
+      });
+    }
+  },
+};