From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 19:32:43 +0200
Subject: Adding upstream version 1:115.7.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 devtools/server/actors/descriptors/moz.build       |  12 +
 devtools/server/actors/descriptors/process.js      | 246 +++++++++++++++
 devtools/server/actors/descriptors/tab.js          | 253 ++++++++++++++++
 devtools/server/actors/descriptors/webextension.js | 336 +++++++++++++++++++++
 devtools/server/actors/descriptors/worker.js       | 182 +++++++++++
 5 files changed, 1029 insertions(+)
 create mode 100644 devtools/server/actors/descriptors/moz.build
 create mode 100644 devtools/server/actors/descriptors/process.js
 create mode 100644 devtools/server/actors/descriptors/tab.js
 create mode 100644 devtools/server/actors/descriptors/webextension.js
 create mode 100644 devtools/server/actors/descriptors/worker.js

(limited to 'devtools/server/actors/descriptors')

diff --git a/devtools/server/actors/descriptors/moz.build b/devtools/server/actors/descriptors/moz.build
new file mode 100644
index 0000000000..bf297b3dcb
--- /dev/null
+++ b/devtools/server/actors/descriptors/moz.build
@@ -0,0 +1,12 @@
+# -*- 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/.
+
+DevToolsModules(
+    "process.js",
+    "tab.js",
+    "webextension.js",
+    "worker.js",
+)
diff --git a/devtools/server/actors/descriptors/process.js b/devtools/server/actors/descriptors/process.js
new file mode 100644
index 0000000000..19944c7d03
--- /dev/null
+++ b/devtools/server/actors/descriptors/process.js
@@ -0,0 +1,246 @@
+/* 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";
+
+/*
+ * Represents any process running in Firefox.
+ * This can be:
+ *  - the parent process, where all top level chrome window runs:
+ *    like browser.xhtml, sidebars, devtools iframes, the browser console, ...
+ *  - any content process
+ *
+ * There is some special cases in the class around:
+ *  - xpcshell, where there is only one process which doesn't expose any DOM document
+ *    And instead of exposing a ParentProcessTargetActor, getTarget will return
+ *    a ContentProcessTargetActor.
+ *  - background task, similarly to xpcshell, they don't expose any DOM document
+ *    and this also works with a ContentProcessTargetActor.
+ *
+ * See devtools/docs/backend/actor-hierarchy.md for more details.
+ */
+
+const { Actor } = require("resource://devtools/shared/protocol.js");
+const {
+  processDescriptorSpec,
+} = require("resource://devtools/shared/specs/descriptors/process.js");
+
+const {
+  DevToolsServer,
+} = require("resource://devtools/server/devtools-server.js");
+
+const {
+  createBrowserSessionContext,
+  createContentProcessSessionContext,
+} = require("resource://devtools/server/actors/watcher/session-context.js");
+
+loader.lazyRequireGetter(
+  this,
+  "ContentProcessTargetActor",
+  "resource://devtools/server/actors/targets/content-process.js",
+  true
+);
+loader.lazyRequireGetter(
+  this,
+  "ParentProcessTargetActor",
+  "resource://devtools/server/actors/targets/parent-process.js",
+  true
+);
+loader.lazyRequireGetter(
+  this,
+  "connectToContentProcess",
+  "resource://devtools/server/connectors/content-process-connector.js",
+  true
+);
+loader.lazyRequireGetter(
+  this,
+  "WatcherActor",
+  "resource://devtools/server/actors/watcher.js",
+  true
+);
+
+class ProcessDescriptorActor extends Actor {
+  constructor(connection, options = {}) {
+    super(connection, processDescriptorSpec);
+
+    if ("id" in options && typeof options.id != "number") {
+      throw Error("process connect requires a valid `id` attribute.");
+    }
+
+    this.id = options.id;
+    this._windowGlobalTargetActor = null;
+    this.isParent = options.parent;
+    this.destroy = this.destroy.bind(this);
+  }
+
+  get browsingContextID() {
+    if (this._windowGlobalTargetActor) {
+      return this._windowGlobalTargetActor.docShell.browsingContext.id;
+    }
+    return null;
+  }
+
+  get isWindowlessParent() {
+    return this.isParent && (this.isXpcshell || this.isBackgroundTaskMode);
+  }
+
+  get isXpcshell() {
+    return Services.env.exists("XPCSHELL_TEST_PROFILE_DIR");
+  }
+
+  get isBackgroundTaskMode() {
+    const bts = Cc["@mozilla.org/backgroundtasks;1"]?.getService(
+      Ci.nsIBackgroundTasks
+    );
+    return bts && bts.isBackgroundTaskMode;
+  }
+
+  _parentProcessConnect() {
+    let targetActor;
+    if (this.isWindowlessParent) {
+      // Check if we are running on xpcshell or in background task mode.
+      // In these modes, there is no valid browsing context to attach to
+      // and so ParentProcessTargetActor doesn't make sense as it inherits from
+      // WindowGlobalTargetActor. So instead use ContentProcessTargetActor, which
+      // matches the needs of these modes.
+      targetActor = new ContentProcessTargetActor(this.conn, {
+        isXpcShellTarget: true,
+        sessionContext: createContentProcessSessionContext(),
+      });
+    } else {
+      // Create the target actor for the parent process, which is in the same process
+      // as this target. Because we are in the same process, we have a true actor that
+      // should be managed by the ProcessDescriptorActor.
+      targetActor = new ParentProcessTargetActor(this.conn, {
+        // This target actor is special and will stay alive as long
+        // as the toolbox/client is alive. It is the original top level target for
+        // the BrowserToolbox and isTopLevelTarget should always be true here.
+        // (It isn't the typical behavior of WindowGlobalTargetActor's base class)
+        isTopLevelTarget: true,
+        sessionContext: createBrowserSessionContext(),
+      });
+      // this is a special field that only parent process with a browsing context
+      // have, as they are the only processes at the moment that have child
+      // browsing contexts
+      this._windowGlobalTargetActor = targetActor;
+    }
+    this.manage(targetActor);
+    // to be consistent with the return value of the _childProcessConnect, we are returning
+    // the form here. This might be memoized in the future
+    return targetActor.form();
+  }
+
+  /**
+   * Connect to a remote process actor, always a ContentProcess target.
+   */
+  async _childProcessConnect() {
+    const { id } = this;
+    const mm = this._lookupMessageManager(id);
+    if (!mm) {
+      return {
+        error: "noProcess",
+        message: "There is no process with id '" + id + "'.",
+      };
+    }
+    const childTargetForm = await connectToContentProcess(
+      this.conn,
+      mm,
+      this.destroy
+    );
+    return childTargetForm;
+  }
+
+  _lookupMessageManager(id) {
+    for (let i = 0; i < Services.ppmm.childCount; i++) {
+      const mm = Services.ppmm.getChildAt(i);
+
+      // A zero id is used for the parent process, instead of its actual pid.
+      if (id ? mm.osPid == id : mm.isInProcess) {
+        return mm;
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Connect the a process actor.
+   */
+  async getTarget() {
+    if (!DevToolsServer.allowChromeProcess) {
+      return {
+        error: "forbidden",
+        message: "You are not allowed to debug processes.",
+      };
+    }
+    if (this.isParent) {
+      return this._parentProcessConnect();
+    }
+    // This is a remote process we are connecting to
+    return this._childProcessConnect();
+  }
+
+  /**
+   * Return a Watcher actor, allowing to keep track of targets which
+   * already exists or will be created. It also helps knowing when they
+   * are destroyed.
+   */
+  getWatcher() {
+    if (!this.watcher) {
+      this.watcher = new WatcherActor(this.conn, createBrowserSessionContext());
+      this.manage(this.watcher);
+    }
+    return this.watcher;
+  }
+
+  form() {
+    return {
+      actor: this.actorID,
+      id: this.id,
+      isParent: this.isParent,
+      isWindowlessParent: this.isWindowlessParent,
+      traits: {
+        // Supports the Watcher actor. Can be removed as part of Bug 1680280.
+        // Bug 1687461: WatcherActor only supports the parent process, where we debug everything.
+        // For the "Browser Content Toolbox", where we debug only one content process,
+        // we will still be using legacy listeners.
+        watcher: this.isParent,
+        // ParentProcessTargetActor can be reloaded.
+        supportsReloadDescriptor: this.isParent && !this.isWindowlessParent,
+      },
+    };
+  }
+
+  async reloadDescriptor() {
+    if (!this.isParent || this.isWindowlessParent) {
+      throw new Error(
+        "reloadDescriptor is only available for parent process descriptors"
+      );
+    }
+
+    // Reload for the parent process will restart the whole browser
+    //
+    // This aims at replicate `DevelopmentHelpers.quickRestart`
+    // This allows a user to do a full firefox restart + session restore
+    // Via Ctrl+Alt+R on the Browser Console/Toolbox
+
+    // Maximize the chance of fetching new source content by clearing the cache
+    Services.obs.notifyObservers(null, "startupcache-invalidate");
+
+    // Avoid safemode popup from appearing on restart
+    Services.env.set("MOZ_DISABLE_SAFE_MODE_KEY", "1");
+
+    Services.startup.quit(
+      Ci.nsIAppStartup.eAttemptQuit | Ci.nsIAppStartup.eRestart
+    );
+  }
+
+  destroy() {
+    this.emit("descriptor-destroyed");
+
+    this._windowGlobalTargetActor = null;
+    super.destroy();
+  }
+}
+
+exports.ProcessDescriptorActor = ProcessDescriptorActor;
diff --git a/devtools/server/actors/descriptors/tab.js b/devtools/server/actors/descriptors/tab.js
new file mode 100644
index 0000000000..ea20d3fb36
--- /dev/null
+++ b/devtools/server/actors/descriptors/tab.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";
+
+/*
+ * Descriptor Actor that represents a Tab in the parent process. It
+ * launches a WindowGlobalTargetActor in the content process to do the real work and tunnels the
+ * data.
+ *
+ * See devtools/docs/backend/actor-hierarchy.md for more details.
+ */
+
+const { Actor } = require("resource://devtools/shared/protocol.js");
+const {
+  tabDescriptorSpec,
+} = require("resource://devtools/shared/specs/descriptors/tab.js");
+
+const {
+  connectToFrame,
+} = require("resource://devtools/server/connectors/frame-connector.js");
+const lazy = {};
+ChromeUtils.defineESModuleGetters(lazy, {
+  PlacesUtils: "resource://gre/modules/PlacesUtils.sys.mjs",
+});
+
+const { AppConstants } = ChromeUtils.importESModule(
+  "resource://gre/modules/AppConstants.sys.mjs"
+);
+const {
+  createBrowserElementSessionContext,
+} = require("resource://devtools/server/actors/watcher/session-context.js");
+
+loader.lazyRequireGetter(
+  this,
+  "WatcherActor",
+  "resource://devtools/server/actors/watcher.js",
+  true
+);
+
+/**
+ * Creates a target actor proxy for handling requests to a single browser frame.
+ * Both <xul:browser> and <iframe mozbrowser> are supported.
+ * This actor is a shim that connects to a WindowGlobalTargetActor in a remote browser process.
+ * All RDP packets get forwarded using the message manager.
+ *
+ * @param connection The main RDP connection.
+ * @param browser <xul:browser> or <iframe mozbrowser> element to connect to.
+ */
+class TabDescriptorActor extends Actor {
+  constructor(connection, browser) {
+    super(connection, tabDescriptorSpec);
+    this._browser = browser;
+  }
+
+  form() {
+    const form = {
+      actor: this.actorID,
+      browserId: this._browser.browserId,
+      browsingContextID:
+        this._browser && this._browser.browsingContext
+          ? this._browser.browsingContext.id
+          : null,
+      isZombieTab: this._isZombieTab(),
+      outerWindowID: this._getOuterWindowId(),
+      selected: this.selected,
+      title: this._getTitle(),
+      traits: {
+        // Supports the Watcher actor. Can be removed as part of Bug 1680280.
+        watcher: true,
+        supportsReloadDescriptor: true,
+      },
+      url: this._getUrl(),
+    };
+
+    return form;
+  }
+
+  _getTitle() {
+    // If the content already provides a title, use it.
+    if (this._browser.contentTitle) {
+      return this._browser.contentTitle;
+    }
+
+    // For zombie or lazy tabs (tab created, but content has not been loaded),
+    // try to retrieve the title from the XUL Tab itself.
+    // Note: this only works on Firefox desktop.
+    if (this._tabbrowser) {
+      const tab = this._tabbrowser.getTabForBrowser(this._browser);
+      if (tab) {
+        return tab.label;
+      }
+    }
+
+    // No title available.
+    return null;
+  }
+
+  _getUrl() {
+    if (!this._browser || !this._browser.browsingContext) {
+      return "";
+    }
+
+    const { browsingContext } = this._browser;
+    return browsingContext.currentWindowGlobal.documentURI.spec;
+  }
+
+  _getOuterWindowId() {
+    if (!this._browser || !this._browser.browsingContext) {
+      return "";
+    }
+
+    const { browsingContext } = this._browser;
+    return browsingContext.currentWindowGlobal.outerWindowId;
+  }
+
+  get selected() {
+    // getMostRecentBrowserWindow will find the appropriate window on Firefox
+    // Desktop and on GeckoView.
+    const topAppWindow = Services.wm.getMostRecentBrowserWindow();
+
+    const selectedBrowser = topAppWindow?.gBrowser?.selectedBrowser;
+    if (!selectedBrowser) {
+      // Note: gBrowser is not available on GeckoView.
+      // We should find another way to know if this browser is the selected
+      // browser. See Bug 1631020.
+      return false;
+    }
+
+    return this._browser === selectedBrowser;
+  }
+
+  async getTarget() {
+    if (!this.conn) {
+      return {
+        error: "tabDestroyed",
+        message: "Tab destroyed while performing a TabDescriptorActor update",
+      };
+    }
+
+    /* eslint-disable-next-line no-async-promise-executor */
+    return new Promise(async (resolve, reject) => {
+      const onDestroy = () => {
+        // Reject the update promise if the tab was destroyed while requesting an update
+        reject({
+          error: "tabDestroyed",
+          message: "Tab destroyed while performing a TabDescriptorActor update",
+        });
+
+        // Targets created from the TabDescriptor are not created via JSWindowActors and
+        // we need to notify the watcher manually about their destruction.
+        // TabDescriptor's targets are created via TabDescriptor.getTarget and are still using
+        // message manager instead of JSWindowActors.
+        if (this.watcher && this.targetActorForm) {
+          this.watcher.notifyTargetDestroyed(this.targetActorForm);
+        }
+      };
+
+      try {
+        // Check if the browser is still connected before calling connectToFrame
+        if (!this._browser.isConnected) {
+          onDestroy();
+          return;
+        }
+
+        const connectForm = await connectToFrame(
+          this.conn,
+          this._browser,
+          onDestroy
+        );
+        this.targetActorForm = connectForm;
+        resolve(connectForm);
+      } catch (e) {
+        reject({
+          error: "tabDestroyed",
+          message: "Tab destroyed while connecting to the frame",
+        });
+      }
+    });
+  }
+
+  /**
+   * Return a Watcher actor, allowing to keep track of targets which
+   * already exists or will be created. It also helps knowing when they
+   * are destroyed.
+   */
+  getWatcher(config) {
+    if (!this.watcher) {
+      this.watcher = new WatcherActor(
+        this.conn,
+        createBrowserElementSessionContext(this._browser, {
+          isServerTargetSwitchingEnabled: config.isServerTargetSwitchingEnabled,
+          isPopupDebuggingEnabled: config.isPopupDebuggingEnabled,
+        })
+      );
+      this.manage(this.watcher);
+    }
+    return this.watcher;
+  }
+
+  get _tabbrowser() {
+    if (this._browser && typeof this._browser.getTabBrowser == "function") {
+      return this._browser.getTabBrowser();
+    }
+    return null;
+  }
+
+  async getFavicon() {
+    if (!AppConstants.MOZ_PLACES) {
+      // PlacesUtils is not supported
+      return null;
+    }
+
+    try {
+      const { data } = await lazy.PlacesUtils.promiseFaviconData(
+        this._getUrl()
+      );
+      return data;
+    } catch (e) {
+      // Favicon unavailable for this url.
+      return null;
+    }
+  }
+
+  _isZombieTab() {
+    // Note: GeckoView doesn't support zombie tabs
+    const tabbrowser = this._tabbrowser;
+    const tab = tabbrowser ? tabbrowser.getTabForBrowser(this._browser) : null;
+    return tab?.hasAttribute && tab.hasAttribute("pending");
+  }
+
+  reloadDescriptor({ bypassCache }) {
+    if (!this._browser || !this._browser.browsingContext) {
+      return;
+    }
+
+    this._browser.browsingContext.reload(
+      bypassCache
+        ? Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_CACHE
+        : Ci.nsIWebNavigation.LOAD_FLAGS_NONE
+    );
+  }
+
+  destroy() {
+    this.emit("descriptor-destroyed");
+    this._browser = null;
+
+    super.destroy();
+  }
+}
+
+exports.TabDescriptorActor = TabDescriptorActor;
diff --git a/devtools/server/actors/descriptors/webextension.js b/devtools/server/actors/descriptors/webextension.js
new file mode 100644
index 0000000000..56e4abfc41
--- /dev/null
+++ b/devtools/server/actors/descriptors/webextension.js
@@ -0,0 +1,336 @@
+/* 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";
+
+/*
+ * Represents a WebExtension add-on in the parent process. This gives some metadata about
+ * the add-on and watches for uninstall events. This uses a proxy to access the
+ * WebExtension in the WebExtension process via the message manager.
+ *
+ * See devtools/docs/backend/actor-hierarchy.md for more details.
+ */
+
+const { Actor } = require("resource://devtools/shared/protocol.js");
+const {
+  webExtensionDescriptorSpec,
+} = require("resource://devtools/shared/specs/descriptors/webextension.js");
+
+const {
+  connectToFrame,
+} = require("resource://devtools/server/connectors/frame-connector.js");
+const {
+  createWebExtensionSessionContext,
+} = require("resource://devtools/server/actors/watcher/session-context.js");
+
+const lazy = {};
+loader.lazyGetter(lazy, "AddonManager", () => {
+  return ChromeUtils.importESModule(
+    "resource://gre/modules/AddonManager.sys.mjs",
+    { loadInDevToolsLoader: false }
+  ).AddonManager;
+});
+loader.lazyGetter(lazy, "ExtensionParent", () => {
+  return ChromeUtils.importESModule(
+    "resource://gre/modules/ExtensionParent.sys.mjs",
+    { loadInDevToolsLoader: false }
+  ).ExtensionParent;
+});
+loader.lazyRequireGetter(
+  this,
+  "WatcherActor",
+  "resource://devtools/server/actors/watcher.js",
+  true
+);
+
+const BGSCRIPT_STATUSES = {
+  RUNNING: "RUNNING",
+  STOPPED: "STOPPED",
+};
+
+/**
+ * Creates the actor that represents the addon in the parent process, which connects
+ * itself to a WebExtensionTargetActor counterpart which is created in the extension
+ * process (or in the main process if the WebExtensions OOP mode is disabled).
+ *
+ * The WebExtensionDescriptorActor subscribes itself as an AddonListener on the AddonManager
+ * and forwards this events to child actor (e.g. on addon reload or when the addon is
+ * uninstalled completely) and connects to the child extension process using a `browser`
+ * element provided by the extension internals (it is not related to any single extension,
+ * but it will be created automatically to the currently selected "WebExtensions OOP mode"
+ * and it persist across the extension reloads (it is destroyed once the actor exits).
+ * WebExtensionDescriptorActor is a child of RootActor, it can be retrieved via
+ * RootActor.listAddons request.
+ *
+ * @param {DevToolsServerConnection} conn
+ *        The connection to the client.
+ * @param {AddonWrapper} addon
+ *        The target addon.
+ */
+class WebExtensionDescriptorActor extends Actor {
+  constructor(conn, addon) {
+    super(conn, webExtensionDescriptorSpec);
+    this.addon = addon;
+    this.addonId = addon.id;
+    this._childFormPromise = null;
+
+    this._onChildExit = this._onChildExit.bind(this);
+    this.destroy = this.destroy.bind(this);
+    lazy.AddonManager.addAddonListener(this);
+  }
+
+  form() {
+    const { addonId } = this;
+    const policy = lazy.ExtensionParent.WebExtensionPolicy.getByID(addonId);
+    const persistentBackgroundScript =
+      lazy.ExtensionParent.DebugUtils.hasPersistentBackgroundScript(addonId);
+    const backgroundScriptStatus = this._getBackgroundScriptStatus();
+
+    return {
+      actor: this.actorID,
+      backgroundScriptStatus,
+      // Note that until the policy becomes active,
+      // getTarget/connectToFrame will fail attaching to the web extension:
+      // https://searchfox.org/mozilla-central/rev/526a5089c61db85d4d43eb0e46edaf1f632e853a/toolkit/components/extensions/WebExtensionPolicy.cpp#551-553
+      debuggable: policy?.active && this.addon.isDebuggable,
+      hidden: this.addon.hidden,
+      // iconDataURL is available after calling loadIconDataURL
+      iconDataURL: this._iconDataURL,
+      iconURL: this.addon.iconURL,
+      id: addonId,
+      isSystem: this.addon.isSystem,
+      isWebExtension: this.addon.isWebExtension,
+      manifestURL: policy && policy.getURL("manifest.json"),
+      name: this.addon.name,
+      persistentBackgroundScript,
+      temporarilyInstalled: this.addon.temporarilyInstalled,
+      traits: {
+        supportsReloadDescriptor: true,
+        // Supports the Watcher actor. Can be removed as part of Bug 1680280.
+        watcher: true,
+      },
+      url: this.addon.sourceURI ? this.addon.sourceURI.spec : undefined,
+      warnings: lazy.ExtensionParent.DebugUtils.getExtensionManifestWarnings(
+        this.addonId
+      ),
+    };
+  }
+
+  /**
+   * Return a Watcher actor, allowing to keep track of targets which
+   * already exists or will be created. It also helps knowing when they
+   * are destroyed.
+   */
+  async getWatcher(config = {}) {
+    if (!this.watcher) {
+      // Ensure connecting to the webextension frame in order to populate this._form
+      await this._extensionFrameConnect();
+      this.watcher = new WatcherActor(
+        this.conn,
+        createWebExtensionSessionContext(
+          {
+            addonId: this.addonId,
+            browsingContextID: this._form.browsingContextID,
+            innerWindowId: this._form.innerWindowId,
+          },
+          config
+        )
+      );
+      this.manage(this.watcher);
+    }
+    return this.watcher;
+  }
+
+  async getTarget() {
+    const form = await this._extensionFrameConnect();
+    // Merge into the child actor form, some addon metadata
+    // (e.g. the addon name shown in the addon debugger window title).
+    return Object.assign(form, {
+      iconURL: this.addon.iconURL,
+      id: this.addon.id,
+      name: this.addon.name,
+    });
+  }
+
+  getChildren() {
+    return [];
+  }
+
+  async _extensionFrameConnect() {
+    if (this._form) {
+      return this._form;
+    }
+
+    this._browser =
+      await lazy.ExtensionParent.DebugUtils.getExtensionProcessBrowser(this);
+
+    const policy = lazy.ExtensionParent.WebExtensionPolicy.getByID(
+      this.addonId
+    );
+    this._form = await connectToFrame(this.conn, this._browser, this.destroy, {
+      addonId: this.addonId,
+      addonBrowsingContextGroupId: policy.browsingContextGroupId,
+      // Bug 1754452: This flag is passed by the client to getWatcher(), but the server
+      // doesn't support this anyway. So always pass false here and keep things simple.
+      // Once we enable this flag, we will stop using connectToFrame and instantiate
+      // the WebExtensionTargetActor from watcher code instead, so that shouldn't
+      // introduce an issue for the future.
+      isServerTargetSwitchingEnabled: false,
+    });
+
+    // connectToFrame may resolve to a null form,
+    // in case the browser element is destroyed before it is fully connected to it.
+    if (!this._form) {
+      throw new Error(
+        "browser element destroyed while connecting to it: " + this.addon.name
+      );
+    }
+
+    this._childActorID = this._form.actor;
+
+    // Exit the proxy child actor if the child actor has been destroyed.
+    this._mm.addMessageListener("debug:webext_child_exit", this._onChildExit);
+
+    return this._form;
+  }
+
+  /**
+   * Note that reloadDescriptor is the common API name for descriptors
+   * which support to be reloaded, while WebExtensionDescriptorActor::reload
+   * is a legacy API which is for instance used from web-ext.
+   *
+   * bypassCache has no impact for addon reloads.
+   */
+  reloadDescriptor({ bypassCache }) {
+    return this.reload();
+  }
+
+  async reload() {
+    await this.addon.reload();
+    return {};
+  }
+
+  async terminateBackgroundScript() {
+    await lazy.ExtensionParent.DebugUtils.terminateBackgroundScript(
+      this.addonId
+    );
+  }
+
+  // This function will be called from RootActor in case that the devtools client
+  // retrieves list of addons with `iconDataURL` option.
+  async loadIconDataURL() {
+    this._iconDataURL = await this.getIconDataURL();
+  }
+
+  async getIconDataURL() {
+    if (!this.addon.iconURL) {
+      return null;
+    }
+
+    const xhr = new XMLHttpRequest();
+    xhr.responseType = "blob";
+    xhr.open("GET", this.addon.iconURL, true);
+
+    if (this.addon.iconURL.toLowerCase().endsWith(".svg")) {
+      // Maybe SVG, thus force to change mime type.
+      xhr.overrideMimeType("image/svg+xml");
+    }
+
+    try {
+      const blob = await new Promise((resolve, reject) => {
+        xhr.onload = () => resolve(xhr.response);
+        xhr.onerror = reject;
+        xhr.send();
+      });
+
+      const reader = new FileReader();
+      return await new Promise((resolve, reject) => {
+        reader.onloadend = () => resolve(reader.result);
+        reader.onerror = reject;
+        reader.readAsDataURL(blob);
+      });
+    } catch (_) {
+      console.warn(`Failed to create data url from [${this.addon.iconURL}]`);
+      return null;
+    }
+  }
+
+  // Private Methods
+  _getBackgroundScriptStatus() {
+    const isRunning = lazy.ExtensionParent.DebugUtils.isBackgroundScriptRunning(
+      this.addonId
+    );
+    // The background script status doesn't apply to this addon (e.g. the addon
+    // type doesn't have any code, like staticthemes/langpacks/dictionaries, or
+    // the extension does not have a background script at all).
+    if (isRunning === undefined) {
+      return undefined;
+    }
+
+    return isRunning ? BGSCRIPT_STATUSES.RUNNING : BGSCRIPT_STATUSES.STOPPED;
+  }
+
+  get _mm() {
+    return (
+      this._browser &&
+      (this._browser.messageManager || this._browser.frameLoader.messageManager)
+    );
+  }
+
+  /**
+   * Handle the child actor exit.
+   */
+  _onChildExit(msg) {
+    if (msg.json.actor !== this._childActorID) {
+      return;
+    }
+
+    this.destroy();
+  }
+
+  // AddonManagerListener callbacks.
+  onInstalled(addon) {
+    if (addon.id != this.addonId) {
+      return;
+    }
+
+    // Update the AddonManager's addon object on reload/update.
+    this.addon = addon;
+  }
+
+  onUninstalled(addon) {
+    if (addon != this.addon) {
+      return;
+    }
+
+    this.destroy();
+  }
+
+  destroy() {
+    lazy.AddonManager.removeAddonListener(this);
+
+    this.addon = null;
+    if (this._mm) {
+      this._mm.removeMessageListener(
+        "debug:webext_child_exit",
+        this._onChildExit
+      );
+
+      this._mm.sendAsyncMessage("debug:webext_parent_exit", {
+        actor: this._childActorID,
+      });
+
+      lazy.ExtensionParent.DebugUtils.releaseExtensionProcessBrowser(this);
+    }
+
+    this._browser = null;
+    this._childActorID = null;
+
+    this.emit("descriptor-destroyed");
+
+    super.destroy();
+  }
+}
+
+exports.WebExtensionDescriptorActor = WebExtensionDescriptorActor;
diff --git a/devtools/server/actors/descriptors/worker.js b/devtools/server/actors/descriptors/worker.js
new file mode 100644
index 0000000000..89ca918e05
--- /dev/null
+++ b/devtools/server/actors/descriptors/worker.js
@@ -0,0 +1,182 @@
+/* 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";
+
+/*
+ * Target actor for any of the various kinds of workers.
+ *
+ * See devtools/docs/backend/actor-hierarchy.md for more details.
+ */
+
+// protocol.js uses objects as exceptions in order to define
+// error packets.
+/* eslint-disable no-throw-literal */
+
+const { Actor } = require("resource://devtools/shared/protocol.js");
+const {
+  workerDescriptorSpec,
+} = require("resource://devtools/shared/specs/descriptors/worker.js");
+
+const {
+  DevToolsServer,
+} = require("resource://devtools/server/devtools-server.js");
+const { XPCOMUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/XPCOMUtils.sys.mjs"
+);
+const {
+  createWorkerSessionContext,
+} = require("resource://devtools/server/actors/watcher/session-context.js");
+
+loader.lazyRequireGetter(
+  this,
+  "connectToWorker",
+  "resource://devtools/server/connectors/worker-connector.js",
+  true
+);
+
+XPCOMUtils.defineLazyServiceGetter(
+  this,
+  "swm",
+  "@mozilla.org/serviceworkers/manager;1",
+  "nsIServiceWorkerManager"
+);
+
+class WorkerDescriptorActor extends Actor {
+  constructor(conn, dbg) {
+    super(conn, workerDescriptorSpec);
+    this._dbg = dbg;
+
+    this._threadActor = null;
+    this._transport = null;
+
+    this._dbgListener = {
+      onClose: this._onWorkerClose.bind(this),
+      onError: this._onWorkerError.bind(this),
+    };
+
+    this._dbg.addListener(this._dbgListener);
+    this._attached = true;
+  }
+
+  form() {
+    const form = {
+      actor: this.actorID,
+
+      consoleActor: this._consoleActor,
+      threadActor: this._threadActor,
+      tracerActor: this._tracerActor,
+
+      id: this._dbg.id,
+      url: this._dbg.url,
+      traits: {},
+      type: this._dbg.type,
+    };
+    if (this._dbg.type === Ci.nsIWorkerDebugger.TYPE_SERVICE) {
+      /**
+       * The ServiceWorkerManager in content processes don't maintain
+       * ServiceWorkerRegistrations; record the ServiceWorker's ID, and
+       * this data will be merged with the corresponding registration in
+       * the parent process.
+       */
+      if (!DevToolsServer.isInChildProcess) {
+        const registration = this._getServiceWorkerRegistrationInfo();
+        form.scope = registration.scope;
+        const newestWorker =
+          registration.activeWorker ||
+          registration.waitingWorker ||
+          registration.installingWorker;
+        form.fetch = newestWorker?.handlesFetchEvents;
+      }
+    }
+    return form;
+  }
+
+  detach() {
+    if (!this._attached) {
+      throw { error: "wrongState" };
+    }
+
+    this.destroy();
+  }
+
+  destroy() {
+    if (this._attached) {
+      this._detach();
+    }
+
+    this.emit("descriptor-destroyed");
+    super.destroy();
+  }
+
+  async getTarget() {
+    if (!this._attached) {
+      return { error: "wrongState" };
+    }
+
+    if (this._threadActor !== null) {
+      return {
+        type: "connected",
+
+        consoleActor: this._consoleActor,
+        threadActor: this._threadActor,
+        tracerActor: this._tracerActor,
+      };
+    }
+
+    try {
+      const { transport, workerTargetForm } = await connectToWorker(
+        this.conn,
+        this._dbg,
+        this.actorID,
+        {
+          sessionContext: createWorkerSessionContext(),
+        }
+      );
+
+      this._consoleActor = workerTargetForm.consoleActor;
+      this._threadActor = workerTargetForm.threadActor;
+      this._tracerActor = workerTargetForm.tracerActor;
+
+      this._transport = transport;
+
+      return {
+        type: "connected",
+
+        consoleActor: this._consoleActor,
+        threadActor: this._threadActor,
+        tracerActor: this._tracerActor,
+
+        url: this._dbg.url,
+      };
+    } catch (error) {
+      return { error: error.toString() };
+    }
+  }
+
+  _onWorkerClose() {
+    this.destroy();
+  }
+
+  _onWorkerError(filename, lineno, message) {
+    console.error("ERROR:", filename, ":", lineno, ":", message);
+  }
+
+  _getServiceWorkerRegistrationInfo() {
+    return swm.getRegistrationByPrincipal(this._dbg.principal, this._dbg.url);
+  }
+
+  _detach() {
+    if (this._threadActor !== null) {
+      this._transport.close();
+      this._transport = null;
+      this._threadActor = null;
+    }
+
+    this._dbg.removeListener(this._dbgListener);
+    this._attached = false;
+  }
+}
+
+exports.WorkerDescriptorActor = WorkerDescriptorActor;
-- 
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