10 files changed, 2180 insertions, 0 deletions
diff --git a/remote/cdp/domains/content/DOM.sys.mjs b/remote/cdp/domains/content/DOM.sys.mjs
new file mode 100644
index 0000000000..34c4e96ea9
--- /dev/null
+++ b/remote/cdp/domains/content/DOM.sys.mjs
@@ -0,0 +1,245 @@
+/* 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/. */
+
+import { ContentProcessDomain } from "chrome://remote/content/cdp/domains/ContentProcessDomain.sys.mjs";
+
+export class DOM extends ContentProcessDomain {
+  constructor(session) {
+    super(session);
+    this.enabled = false;
+  }
+
+  destructor() {
+    this.disable();
+  }
+
+  // commands
+
+  async enable() {
+    if (!this.enabled) {
+      this.enabled = true;
+    }
+  }
+
+  /**
+   * Describes node given its id.
+   *
+   * Does not require domain to be enabled. Does not start tracking any objects.
+   *
+   * @param {object} options
+   * @param {number=} options.backendNodeId [not supported]
+   *     Identifier of the backend node.
+   * @param {number=} options.depth [not supported]
+   *     The maximum depth at which children should be retrieved, defaults to 1.
+   *     Use -1 for the entire subtree or provide an integer larger than 0.
+   * @param {number=} options.nodeId [not supported]
+   *     Identifier of the node.
+   * @param {string} options.objectId
+   *     JavaScript object id of the node wrapper.
+   * @param {boolean=} options.pierce [not supported]
+   *     Whether or not iframes and shadow roots should be traversed
+   *     when returning the subtree, defaults to false.
+   *
+   * @returns {DOM.Node}
+   *     Node description.
+   */
+  describeNode(options = {}) {
+    const { objectId } = options;
+
+    // Until nodeId/backendNodeId is supported force usage of the objectId
+    if (!["string"].includes(typeof objectId)) {
+      throw new TypeError("objectId: string value expected");
+    }
+
+    const Runtime = this.session.domains.get("Runtime");
+    const debuggerObj = Runtime._getRemoteObject(objectId);
+    if (!debuggerObj) {
+      throw new Error("Could not find object with given id");
+    }
+
+    if (typeof debuggerObj.nodeId == "undefined") {
+      throw new Error("Object id doesn't reference a Node");
+    }
+
+    const unsafeObj = debuggerObj.unsafeDereference();
+
+    const attributes = [];
+    if (unsafeObj.attributes) {
+      // Flatten the list of attributes for name and value
+      for (const attribute of unsafeObj.attributes) {
+        attributes.push(attribute.name, attribute.value);
+      }
+    }
+
+    let context = this.docShell.browsingContext;
+    if (HTMLIFrameElement.isInstance(unsafeObj)) {
+      context = unsafeObj.contentWindow.docShell.browsingContext;
+    }
+
+    const node = {
+      nodeId: debuggerObj.nodeId,
+      backendNodeId: debuggerObj.backendNodeId,
+      nodeType: unsafeObj.nodeType,
+      nodeName: unsafeObj.nodeName,
+      localName: unsafeObj.localName,
+      nodeValue: unsafeObj.nodeValue ? unsafeObj.nodeValue.toString() : "",
+      childNodeCount: unsafeObj.childElementCount,
+      attributes: attributes.length ? attributes : undefined,
+      frameId: context.id.toString(),
+    };
+
+    return { node };
+  }
+
+  disable() {
+    if (this.enabled) {
+      this.enabled = false;
+    }
+  }
+
+  getContentQuads(options = {}) {
+    const { objectId } = options;
+    const Runtime = this.session.domains.get("Runtime");
+    const debuggerObj = Runtime._getRemoteObject(objectId);
+    if (!debuggerObj) {
+      throw new Error(`Cannot find object with id: ${objectId}`);
+    }
+    const unsafeObject = debuggerObj.unsafeDereference();
+    if (!unsafeObject.getBoxQuads) {
+      throw new Error("RemoteObject is not a node");
+    }
+    let quads = unsafeObject.getBoxQuads({ relativeTo: this.content.document });
+    quads = quads.map(quad => {
+      return [
+        quad.p1.x,
+        quad.p1.y,
+        quad.p2.x,
+        quad.p2.y,
+        quad.p3.x,
+        quad.p3.y,
+        quad.p4.x,
+        quad.p4.y,
+      ].map(Math.round);
+    });
+    return { quads };
+  }
+
+  getBoxModel(options = {}) {
+    const { objectId } = options;
+    const Runtime = this.session.domains.get("Runtime");
+    const debuggerObj = Runtime._getRemoteObject(objectId);
+    if (!debuggerObj) {
+      throw new Error(`Cannot find object with id: ${objectId}`);
+    }
+    const unsafeObject = debuggerObj.unsafeDereference();
+    const bounding = unsafeObject.getBoundingClientRect();
+    const model = {
+      width: Math.round(bounding.width),
+      height: Math.round(bounding.height),
+    };
+    for (const box of ["content", "padding", "border", "margin"]) {
+      const quads = unsafeObject.getBoxQuads({
+        box,
+        relativeTo: this.content.document,
+      });
+
+      // getBoxQuads may return more than one element. In this case we have to compute the bounding box
+      // of all these boxes.
+      let bounding = {
+        p1: { x: Infinity, y: Infinity },
+        p2: { x: -Infinity, y: Infinity },
+        p3: { x: -Infinity, y: -Infinity },
+        p4: { x: Infinity, y: -Infinity },
+      };
+      quads.forEach(quad => {
+        bounding = {
+          p1: {
+            x: Math.min(bounding.p1.x, quad.p1.x),
+            y: Math.min(bounding.p1.y, quad.p1.y),
+          },
+          p2: {
+            x: Math.max(bounding.p2.x, quad.p2.x),
+            y: Math.min(bounding.p2.y, quad.p2.y),
+          },
+          p3: {
+            x: Math.max(bounding.p3.x, quad.p3.x),
+            y: Math.max(bounding.p3.y, quad.p3.y),
+          },
+          p4: {
+            x: Math.min(bounding.p4.x, quad.p4.x),
+            y: Math.max(bounding.p4.y, quad.p4.y),
+          },
+        };
+      });
+
+      model[box] = [
+        bounding.p1.x,
+        bounding.p1.y,
+        bounding.p2.x,
+        bounding.p2.y,
+        bounding.p3.x,
+        bounding.p3.y,
+        bounding.p4.x,
+        bounding.p4.y,
+      ].map(Math.round);
+    }
+    return {
+      model,
+    };
+  }
+
+  /**
+   * Resolves the JavaScript node object for a given NodeId or BackendNodeId.
+   *
+   * @param {object} options
+   * @param {number} options.backendNodeId [required for now]
+   *     Backend identifier of the node to resolve.
+   * @param {number=} options.executionContextId
+   *     Execution context in which to resolve the node.
+   * @param {number=} options.nodeId [not supported]
+   *     Id of the node to resolve.
+   * @param {string=} options.objectGroup [not supported]
+   *     Symbolic group name that can be used to release multiple objects.
+   *
+   * @returns {Runtime.RemoteObject}
+   *     JavaScript object wrapper for given node.
+   */
+  resolveNode(options = {}) {
+    const { backendNodeId, executionContextId } = options;
+
+    // Until nodeId is supported force usage of the backendNodeId
+    if (!["number"].includes(typeof backendNodeId)) {
+      throw new TypeError("backendNodeId: number value expected");
+    }
+    if (!["undefined", "number"].includes(typeof executionContextId)) {
+      throw new TypeError("executionContextId: integer value expected");
+    }
+
+    const Runtime = this.session.domains.get("Runtime");
+
+    // Retrieve the node to resolve, and its context
+    const debuggerObj = Runtime._getRemoteObjectByNodeId(backendNodeId);
+
+    if (!debuggerObj) {
+      throw new Error(`No node with given id found`);
+    }
+
+    // If execution context isn't specified use the default one for the node
+    let context;
+    if (typeof executionContextId != "undefined") {
+      context = Runtime.contexts.get(executionContextId);
+      if (!context) {
+        throw new Error(`Node with given id does not belong to the document`);
+      }
+    } else {
+      context = Runtime._getDefaultContextForWindow();
+    }
+
+    Runtime._setRemoteObject(debuggerObj, context);
+
+    return {
+      object: Runtime._serializeRemoteObject(debuggerObj, context.id),
+    };
+  }
+}
diff --git a/remote/cdp/domains/content/Emulation.sys.mjs b/remote/cdp/domains/content/Emulation.sys.mjs
new file mode 100644
index 0000000000..41bb0c76ea
--- /dev/null
+++ b/remote/cdp/domains/content/Emulation.sys.mjs
@@ -0,0 +1,50 @@
+/* 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/. */
+
+import { ContentProcessDomain } from "chrome://remote/content/cdp/domains/ContentProcessDomain.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  AnimationFramePromise: "chrome://remote/content/shared/Sync.sys.mjs",
+});
+
+export class Emulation extends ContentProcessDomain {
+  // commands
+
+  /**
+   * Internal methods: the following methods are not part of CDP;
+   * note the _ prefix.
+   */
+
+  /**
+   * Waits until the viewport has reached the new dimensions.
+   */
+  async _awaitViewportDimensions({ width, height }) {
+    const win = this.content;
+    let resized;
+
+    // Updates for background tabs are throttled, and we also we have to make
+    // sure that the new browser dimensions have been received by the content
+    // process. As such wait for the next animation frame.
+    await lazy.AnimationFramePromise(win);
+
+    const checkBrowserSize = () => {
+      if (win.innerWidth === width && win.innerHeight === height) {
+        resized();
+      }
+    };
+
+    return new Promise(resolve => {
+      resized = resolve;
+
+      win.addEventListener("resize", checkBrowserSize);
+
+      // Trigger a layout flush in case none happened yet.
+      checkBrowserSize();
+    }).finally(() => {
+      win.removeEventListener("resize", checkBrowserSize);
+    });
+  }
+}
diff --git a/remote/cdp/domains/content/Input.sys.mjs b/remote/cdp/domains/content/Input.sys.mjs
new file mode 100644
index 0000000000..e7a6ffc709
--- /dev/null
+++ b/remote/cdp/domains/content/Input.sys.mjs
@@ -0,0 +1,57 @@
+/* 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/. */
+
+import { ContentProcessDomain } from "chrome://remote/content/cdp/domains/ContentProcessDomain.sys.mjs";
+
+export class Input extends ContentProcessDomain {
+  constructor(session) {
+    super(session);
+
+    // Internal id used to track existing event handlers.
+    this._eventId = 0;
+
+    // Map of event id -> event handler promise.
+    this._eventPromises = new Map();
+  }
+
+  /**
+   * Internal methods: the following methods are not part of CDP;
+   * note the _ prefix.
+   */
+
+  /**
+   * Add an event listener in the content page for the provided eventName.
+   * This method will return a unique handler id that can be used to wait
+   * for the event.
+   *
+   * Example usage from a parent process domain:
+   *
+   *   const id = await this.executeInChild("_addContentEventListener", "click");
+   *   // do something that triggers a click in content
+   *   await this.executeInChild("_waitForContentEvent", id);
+   */
+  _addContentEventListener(eventName) {
+    const eventPromise = new Promise(resolve => {
+      this.chromeEventHandler.addEventListener(eventName, resolve, {
+        mozSystemGroup: true,
+        once: true,
+      });
+    });
+    this._eventId++;
+    this._eventPromises.set(this._eventId, eventPromise);
+    return this._eventId;
+  }
+
+  /**
+   * Wait for an event listener added via `addContentEventListener` to be fired.
+   */
+  async _waitForContentEvent(eventId) {
+    const eventPromise = this._eventPromises.get(eventId);
+    if (!eventPromise) {
+      throw new Error("No event promise found for id " + eventId);
+    }
+    await eventPromise;
+    this._eventPromises.delete(eventId);
+  }
+}
diff --git a/remote/cdp/domains/content/Log.sys.mjs b/remote/cdp/domains/content/Log.sys.mjs
new file mode 100644
index 0000000000..f8c561d429
--- /dev/null
+++ b/remote/cdp/domains/content/Log.sys.mjs
@@ -0,0 +1,86 @@
+/* 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/. */
+
+import { ContentProcessDomain } from "chrome://remote/content/cdp/domains/ContentProcessDomain.sys.mjs";
+
+const CONSOLE_MESSAGE_LEVEL_MAP = {
+  [Ci.nsIConsoleMessage.debug]: "verbose",
+  [Ci.nsIConsoleMessage.info]: "info",
+  [Ci.nsIConsoleMessage.warn]: "warning",
+  [Ci.nsIConsoleMessage.error]: "error",
+};
+
+export class Log extends ContentProcessDomain {
+  constructor(session) {
+    super(session);
+    this.enabled = false;
+  }
+
+  destructor() {
+    this.disable();
+
+    super.destructor();
+  }
+
+  enable() {
+    if (!this.enabled) {
+      this.enabled = true;
+
+      Services.console.registerListener(this);
+    }
+  }
+
+  disable() {
+    if (this.enabled) {
+      this.enabled = false;
+
+      Services.console.unregisterListener(this);
+    }
+  }
+
+  _getLogCategory(category) {
+    if (category.startsWith("CORS")) {
+      return "network";
+    } else if (category.includes("javascript")) {
+      return "javascript";
+    }
+
+    return "other";
+  }
+
+  // nsIObserver
+
+  /**
+   * Takes all script error messages that do not have an exception attached,
+   * and emits a "Log.entryAdded" event.
+   *
+   * @param {nsIConsoleMessage} message
+   *     Message originating from the nsIConsoleService.
+   */
+  observe(message) {
+    if (message instanceof Ci.nsIScriptError && !message.hasException) {
+      let url;
+      if (message.sourceName !== "debugger eval code") {
+        url = message.sourceName;
+      }
+
+      const entry = {
+        source: this._getLogCategory(message.category),
+        level: CONSOLE_MESSAGE_LEVEL_MAP[message.logLevel],
+        text: message.errorMessage,
+        timestamp: message.timeStamp,
+        url,
+        lineNumber: message.lineNumber,
+      };
+
+      this.emit("Log.entryAdded", { entry });
+    }
+  }
+
+  // XPCOM
+
+  get QueryInterface() {
+    return ChromeUtils.generateQI(["nsIConsoleListener"]);
+  }
+}
diff --git a/remote/cdp/domains/content/Network.sys.mjs b/remote/cdp/domains/content/Network.sys.mjs
new file mode 100644
index 0000000000..91dc44cf46
--- /dev/null
+++ b/remote/cdp/domains/content/Network.sys.mjs
@@ -0,0 +1,18 @@
+/* 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/. */
+
+import { ContentProcessDomain } from "chrome://remote/content/cdp/domains/ContentProcessDomain.sys.mjs";
+
+export class Network extends ContentProcessDomain {
+  // commands
+
+  /**
+   * Internal methods: the following methods are not part of CDP;
+   * note the _ prefix.
+   */
+
+  _updateLoadFlags(flags) {
+    this.docShell.defaultLoadFlags = flags;
+  }
+}
diff --git a/remote/cdp/domains/content/Page.sys.mjs b/remote/cdp/domains/content/Page.sys.mjs
new file mode 100644
index 0000000000..8e1abefe56
--- /dev/null
+++ b/remote/cdp/domains/content/Page.sys.mjs
@@ -0,0 +1,453 @@
+/* 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/. */
+
+import { ContentProcessDomain } from "chrome://remote/content/cdp/domains/ContentProcessDomain.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  generateUUID: "chrome://remote/content/shared/UUID.sys.mjs",
+});
+
+const { LOAD_FLAGS_BYPASS_CACHE, LOAD_FLAGS_BYPASS_PROXY, LOAD_FLAGS_NONE } =
+  Ci.nsIWebNavigation;
+
+export class Page extends ContentProcessDomain {
+  constructor(session) {
+    super(session);
+
+    this.enabled = false;
+    this.lifecycleEnabled = false;
+    // script id => { source, worldName }
+    this.scriptsToEvaluateOnLoad = new Map();
+    this.worldsToEvaluateOnLoad = new Set();
+
+    // This map is used to keep a reference to the loader id for
+    // those Page events, which do not directly rely on
+    // Network events. This might be a temporary solution until
+    // the Network observer could be queried for that. But right
+    // now this lives in the parent process.
+    this.frameIdToLoaderId = new Map();
+
+    this._onFrameAttached = this._onFrameAttached.bind(this);
+    this._onFrameDetached = this._onFrameDetached.bind(this);
+    this._onFrameNavigated = this._onFrameNavigated.bind(this);
+    this._onScriptLoaded = this._onScriptLoaded.bind(this);
+
+    this.session.contextObserver.on("script-loaded", this._onScriptLoaded);
+  }
+
+  destructor() {
+    this.setLifecycleEventsEnabled({ enabled: false });
+    this.session.contextObserver.off("script-loaded", this._onScriptLoaded);
+    this.disable();
+
+    super.destructor();
+  }
+
+  // commands
+
+  async enable() {
+    if (!this.enabled) {
+      this.session.contextObserver.on("frame-attached", this._onFrameAttached);
+      this.session.contextObserver.on("frame-detached", this._onFrameDetached);
+      this.session.contextObserver.on(
+        "frame-navigated",
+        this._onFrameNavigated
+      );
+
+      this.chromeEventHandler.addEventListener("readystatechange", this, {
+        mozSystemGroup: true,
+        capture: true,
+      });
+      this.chromeEventHandler.addEventListener("pagehide", this, {
+        mozSystemGroup: true,
+      });
+      this.chromeEventHandler.addEventListener("unload", this, {
+        mozSystemGroup: true,
+        capture: true,
+      });
+      this.chromeEventHandler.addEventListener("DOMContentLoaded", this, {
+        mozSystemGroup: true,
+      });
+      this.chromeEventHandler.addEventListener("hashchange", this, {
+        mozSystemGroup: true,
+        capture: true,
+      });
+      this.chromeEventHandler.addEventListener("load", this, {
+        mozSystemGroup: true,
+        capture: true,
+      });
+      this.chromeEventHandler.addEventListener("pageshow", this, {
+        mozSystemGroup: true,
+      });
+
+      this.enabled = true;
+    }
+  }
+
+  disable() {
+    if (this.enabled) {
+      this.session.contextObserver.off("frame-attached", this._onFrameAttached);
+      this.session.contextObserver.off("frame-detached", this._onFrameDetached);
+      this.session.contextObserver.off(
+        "frame-navigated",
+        this._onFrameNavigated
+      );
+
+      this.chromeEventHandler.removeEventListener("readystatechange", this, {
+        mozSystemGroup: true,
+        capture: true,
+      });
+      this.chromeEventHandler.removeEventListener("pagehide", this, {
+        mozSystemGroup: true,
+      });
+      this.chromeEventHandler.removeEventListener("unload", this, {
+        mozSystemGroup: true,
+        capture: true,
+      });
+      this.chromeEventHandler.removeEventListener("DOMContentLoaded", this, {
+        mozSystemGroup: true,
+      });
+      this.chromeEventHandler.removeEventListener("hashchange", this, {
+        mozSystemGroup: true,
+        capture: true,
+      });
+      this.chromeEventHandler.removeEventListener("load", this, {
+        mozSystemGroup: true,
+        capture: true,
+      });
+      this.chromeEventHandler.removeEventListener("pageshow", this, {
+        mozSystemGroup: true,
+      });
+      this.enabled = false;
+    }
+  }
+
+  async reload(options = {}) {
+    const { ignoreCache } = options;
+    let flags = LOAD_FLAGS_NONE;
+    if (ignoreCache) {
+      flags |= LOAD_FLAGS_BYPASS_CACHE;
+      flags |= LOAD_FLAGS_BYPASS_PROXY;
+    }
+    this.docShell.reload(flags);
+  }
+
+  getFrameTree() {
+    const getFrames = context => {
+      const frameTree = {
+        frame: this._getFrameDetails({ context }),
+      };
+
+      if (context.children.length) {
+        const frames = [];
+        for (const childContext of context.children) {
+          frames.push(getFrames(childContext));
+        }
+        frameTree.childFrames = frames;
+      }
+
+      return frameTree;
+    };
+
+    return {
+      frameTree: getFrames(this.docShell.browsingContext),
+    };
+  }
+
+  /**
+   * Enqueues given script to be evaluated in every frame upon creation
+   *
+   * If `worldName` is specified, creates an execution context with the given name
+   * and evaluates given script in it.
+   *
+   * At this time, queued scripts do not get evaluated, hence `source` is marked as
+   * "unsupported".
+   *
+   * @param {object} options
+   * @param {string} options.source (not supported)
+   * @param {string=} options.worldName
+   * @returns {string} Page.ScriptIdentifier
+   */
+  addScriptToEvaluateOnNewDocument(options = {}) {
+    const { source, worldName } = options;
+    if (worldName) {
+      this.worldsToEvaluateOnLoad.add(worldName);
+    }
+    const identifier = lazy.generateUUID();
+    this.scriptsToEvaluateOnLoad.set(identifier, { worldName, source });
+
+    return { identifier };
+  }
+
+  /**
+   * Creates an isolated world for the given frame.
+   *
+   * Really it just creates an execution context with label "isolated".
+   *
+   * @param {object} options
+   * @param {string} options.frameId
+   *     Id of the frame in which the isolated world should be created.
+   * @param {string=} options.worldName
+   *     An optional name which is reported in the Execution Context.
+   * @param {boolean=} options.grantUniversalAccess (not supported)
+   *     This is a powerful option, use with caution.
+   *
+   * @returns {number} Runtime.ExecutionContextId
+   *     Execution context of the isolated world.
+   */
+  createIsolatedWorld(options = {}) {
+    const { frameId, worldName } = options;
+
+    if (typeof frameId != "string") {
+      throw new TypeError("frameId: string value expected");
+    }
+
+    if (!["undefined", "string"].includes(typeof worldName)) {
+      throw new TypeError("worldName: string value expected");
+    }
+
+    const Runtime = this.session.domains.get("Runtime");
+    const contexts = Runtime._getContextsForFrame(frameId);
+    if (!contexts.length) {
+      throw new Error("No frame for given id found");
+    }
+
+    const defaultContext = Runtime._getDefaultContextForWindow(
+      contexts[0].windowId
+    );
+    const window = defaultContext.window;
+
+    const executionContextId = Runtime._onContextCreated("context-created", {
+      windowId: window.windowGlobalChild.innerWindowId,
+      window,
+      isDefault: false,
+      contextName: worldName,
+      contextType: "isolated",
+    });
+
+    return { executionContextId };
+  }
+
+  /**
+   * Controls whether page will emit lifecycle events.
+   *
+   * @param {object} options
+   * @param {boolean} options.enabled
+   *     If true, starts emitting lifecycle events.
+   */
+  setLifecycleEventsEnabled(options = {}) {
+    const { enabled } = options;
+
+    this.lifecycleEnabled = enabled;
+  }
+
+  url() {
+    return this.content.location.href;
+  }
+
+  _onFrameAttached(name, { frameId, window }) {
+    const bc = BrowsingContext.get(frameId);
+
+    // Don't emit for top-level browsing contexts
+    if (!bc.parent) {
+      return;
+    }
+
+    // TODO: Use a unique identifier for frames (bug 1605359)
+    this.emit("Page.frameAttached", {
+      frameId: frameId.toString(),
+      parentFrameId: bc.parent.id.toString(),
+      stack: null,
+    });
+
+    // Usually both events are emitted when the "pagehide" event is received.
+    // But this wont happen for a new window or frame when the initial
+    // about:blank page has already loaded, and is being replaced with the
+    // final document.
+    if (!window.document.isInitialDocument) {
+      this.emit("Page.frameStartedLoading", { frameId: frameId.toString() });
+
+      const loaderId = this.frameIdToLoaderId.get(frameId);
+      const timestamp = Date.now() / 1000;
+      this.emitLifecycleEvent(frameId, loaderId, "init", timestamp);
+    }
+  }
+
+  _onFrameDetached(name, { frameId }) {
+    const bc = BrowsingContext.get(frameId);
+
+    // Don't emit for top-level browsing contexts
+    if (!bc.parent) {
+      return;
+    }
+
+    // TODO: Use a unique identifier for frames (bug 1605359)
+    this.emit("Page.frameDetached", { frameId: frameId.toString() });
+  }
+
+  _onFrameNavigated(name, { frameId }) {
+    const bc = BrowsingContext.get(frameId);
+
+    this.emit("Page.frameNavigated", {
+      frame: this._getFrameDetails({ context: bc }),
+    });
+  }
+
+  /**
+   * @param {string} name
+   *     The event name.
+   * @param {object=} options
+   * @param {number} options.windowId
+   *     The inner window id of the window the script has been loaded for.
+   * @param {Window} options.window
+   *     The window object of the document.
+   */
+  _onScriptLoaded(name, options = {}) {
+    const { windowId, window } = options;
+
+    const Runtime = this.session.domains.get("Runtime");
+    for (const world of this.worldsToEvaluateOnLoad) {
+      Runtime._onContextCreated("context-created", {
+        windowId,
+        window,
+        isDefault: false,
+        contextName: world,
+        contextType: "isolated",
+      });
+    }
+    // TODO evaluate each onNewDoc script in the appropriate world
+  }
+
+  emitLifecycleEvent(frameId, loaderId, name, timestamp) {
+    if (this.lifecycleEnabled) {
+      this.emit("Page.lifecycleEvent", {
+        frameId: frameId.toString(),
+        loaderId,
+        name,
+        timestamp,
+      });
+    }
+  }
+
+  handleEvent({ type, target }) {
+    const timestamp = Date.now() / 1000;
+
+    // Some events such as "hashchange" use the window as the target, while
+    // others have a document.
+    const win = Window.isInstance(target) ? target : target.defaultView;
+    const frameId = win.docShell.browsingContext.id;
+    const isFrame = !!win.docShell.browsingContext.parent;
+    const loaderId = this.frameIdToLoaderId.get(frameId);
+    const url = win.location.href;
+
+    switch (type) {
+      case "DOMContentLoaded":
+        if (!isFrame) {
+          this.emit("Page.domContentEventFired", { timestamp });
+        }
+        this.emitLifecycleEvent(
+          frameId,
+          loaderId,
+          "DOMContentLoaded",
+          timestamp
+        );
+        break;
+
+      case "hashchange":
+        this.emit("Page.navigatedWithinDocument", {
+          frameId: frameId.toString(),
+          url,
+        });
+        break;
+
+      case "pagehide":
+        // Maybe better to bound to "unload" once we can register for this event
+        this.emit("Page.frameStartedLoading", { frameId: frameId.toString() });
+        this.emitLifecycleEvent(frameId, loaderId, "init", timestamp);
+        break;
+
+      case "load":
+        if (!isFrame) {
+          this.emit("Page.loadEventFired", { timestamp });
+        }
+        this.emitLifecycleEvent(frameId, loaderId, "load", timestamp);
+
+        // XXX this should most likely be sent differently
+        this.emit("Page.frameStoppedLoading", { frameId: frameId.toString() });
+        break;
+
+      case "readystatechange":
+        if (this.content.document.readyState === "loading") {
+          this.emitLifecycleEvent(frameId, loaderId, "init", timestamp);
+        }
+    }
+  }
+
+  _updateLoaderId(data) {
+    const { frameId, loaderId } = data;
+
+    this.frameIdToLoaderId.set(frameId, loaderId);
+  }
+
+  _contentRect() {
+    const docEl = this.content.document.documentElement;
+
+    return {
+      x: 0,
+      y: 0,
+      width: docEl.scrollWidth,
+      height: docEl.scrollHeight,
+    };
+  }
+
+  _devicePixelRatio() {
+    return (
+      this.content.browsingContext.overrideDPPX || this.content.devicePixelRatio
+    );
+  }
+
+  _getFrameDetails({ context, id }) {
+    const bc = context || BrowsingContext.get(id);
+    const frame = bc.embedderElement;
+
+    return {
+      id: bc.id.toString(),
+      parentId: bc.parent?.id.toString(),
+      loaderId: this.frameIdToLoaderId.get(bc.id),
+      url: bc.docShell.domWindow.location.href,
+      name: frame?.id || frame?.name,
+      securityOrigin: null,
+      mimeType: null,
+    };
+  }
+
+  _getScrollbarSize() {
+    const scrollbarHeight = {};
+    const scrollbarWidth = {};
+
+    this.content.windowUtils.getScrollbarSize(
+      false,
+      scrollbarWidth,
+      scrollbarHeight
+    );
+
+    return {
+      width: scrollbarWidth.value,
+      height: scrollbarHeight.value,
+    };
+  }
+
+  _layoutViewport() {
+    const scrollbarSize = this._getScrollbarSize();
+
+    return {
+      pageX: this.content.pageXOffset,
+      pageY: this.content.pageYOffset,
+      clientWidth: this.content.innerWidth - scrollbarSize.width,
+      clientHeight: this.content.innerHeight - scrollbarSize.height,
+    };
+  }
+}
diff --git a/remote/cdp/domains/content/Performance.sys.mjs b/remote/cdp/domains/content/Performance.sys.mjs
new file mode 100644
index 0000000000..e5726725b5
--- /dev/null
+++ b/remote/cdp/domains/content/Performance.sys.mjs
@@ -0,0 +1,32 @@
+/* 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/. */
+
+import { ContentProcessDomain } from "chrome://remote/content/cdp/domains/ContentProcessDomain.sys.mjs";
+
+export class Performance extends ContentProcessDomain {
+  constructor(session) {
+    super(session);
+    this.enabled = false;
+  }
+
+  destructor() {
+    this.disable();
+
+    super.destructor();
+  }
+
+  // commands
+
+  async enable() {
+    if (!this.enabled) {
+      this.enabled = true;
+    }
+  }
+
+  disable() {
+    if (this.enabled) {
+      this.enabled = false;
+    }
+  }
+}
diff --git a/remote/cdp/domains/content/Runtime.sys.mjs b/remote/cdp/domains/content/Runtime.sys.mjs
new file mode 100644
index 0000000000..9c8092e3ef
--- /dev/null
+++ b/remote/cdp/domains/content/Runtime.sys.mjs
@@ -0,0 +1,643 @@
+/* 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/. */
+
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+
+import { addDebuggerToGlobal } from "resource://gre/modules/jsdebugger.sys.mjs";
+
+import { ContentProcessDomain } from "chrome://remote/content/cdp/domains/ContentProcessDomain.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  executeSoon: "chrome://remote/content/shared/Sync.sys.mjs",
+  isChromeFrame: "chrome://remote/content/shared/Stack.sys.mjs",
+  ExecutionContext:
+    "chrome://remote/content/cdp/domains/content/runtime/ExecutionContext.sys.mjs",
+});
+
+XPCOMUtils.defineLazyGetter(lazy, "ConsoleAPIStorage", () => {
+  return Cc["@mozilla.org/consoleAPI-storage;1"].getService(
+    Ci.nsIConsoleAPIStorage
+  );
+});
+
+// Import the `Debugger` constructor in the current scope
+// eslint-disable-next-line mozilla/reject-globalThis-modification
+addDebuggerToGlobal(globalThis);
+
+const CONSOLE_API_LEVEL_MAP = {
+  warn: "warning",
+};
+
+// Bug 1786299: Puppeteer needs specific error messages.
+const ERROR_CONTEXT_NOT_FOUND = "Cannot find context with specified id";
+
+class SetMap extends Map {
+  constructor() {
+    super();
+    this._count = 1;
+  }
+  // Every key in the map is associated with a Set.
+  // The first time `key` is used `obj.set(key, value)` maps `key` to
+  // to `Set(value)`. Subsequent calls add more values to the Set for `key`.
+  // Note that `obj.get(key)` will return undefined if there's no such key,
+  // as in a regular Map.
+  set(key, value) {
+    const innerSet = this.get(key);
+    if (innerSet) {
+      innerSet.add(value);
+    } else {
+      super.set(key, new Set([value]));
+    }
+    this._count++;
+    return this;
+  }
+  // used as ExecutionContext id
+  get count() {
+    return this._count;
+  }
+}
+
+export class Runtime extends ContentProcessDomain {
+  constructor(session) {
+    super(session);
+    this.enabled = false;
+
+    // Map of all the ExecutionContext instances:
+    // [id (Number) => ExecutionContext instance]
+    this.contexts = new Map();
+    // [innerWindowId (Number) => Set of ExecutionContext instances]
+    this.innerWindowIdToContexts = new SetMap();
+
+    this._onContextCreated = this._onContextCreated.bind(this);
+    this._onContextDestroyed = this._onContextDestroyed.bind(this);
+
+    // TODO Bug 1602083
+    this.session.contextObserver.on("context-created", this._onContextCreated);
+    this.session.contextObserver.on(
+      "context-destroyed",
+      this._onContextDestroyed
+    );
+  }
+
+  destructor() {
+    this.disable();
+
+    this.session.contextObserver.off("context-created", this._onContextCreated);
+    this.session.contextObserver.off(
+      "context-destroyed",
+      this._onContextDestroyed
+    );
+
+    super.destructor();
+  }
+
+  // commands
+
+  async enable() {
+    if (!this.enabled) {
+      this.enabled = true;
+
+      Services.console.registerListener(this);
+      this.onConsoleLogEvent = this.onConsoleLogEvent.bind(this);
+      lazy.ConsoleAPIStorage.addLogEventListener(
+        this.onConsoleLogEvent,
+        Cc["@mozilla.org/systemprincipal;1"].createInstance(Ci.nsIPrincipal)
+      );
+
+      // Spin the event loop in order to send the `executionContextCreated` event right
+      // after we replied to `enable` request.
+      lazy.executeSoon(() => {
+        this._onContextCreated("context-created", {
+          windowId: this.content.windowGlobalChild.innerWindowId,
+          window: this.content,
+          isDefault: true,
+        });
+
+        for (const message of lazy.ConsoleAPIStorage.getEvents()) {
+          this.onConsoleLogEvent(message);
+        }
+      });
+    }
+  }
+
+  disable() {
+    if (this.enabled) {
+      this.enabled = false;
+
+      Services.console.unregisterListener(this);
+      lazy.ConsoleAPIStorage.removeLogEventListener(this.onConsoleLogEvent);
+    }
+  }
+
+  releaseObject(options = {}) {
+    const { objectId } = options;
+
+    let context = null;
+    for (const ctx of this.contexts.values()) {
+      if (ctx.hasRemoteObject(objectId)) {
+        context = ctx;
+        break;
+      }
+    }
+    if (!context) {
+      throw new Error(ERROR_CONTEXT_NOT_FOUND);
+    }
+    context.releaseObject(objectId);
+  }
+
+  /**
+   * Calls function with given declaration on the given object.
+   *
+   * Object group of the result is inherited from the target object.
+   *
+   * @param {object} options
+   * @param {string} options.functionDeclaration
+   *     Declaration of the function to call.
+   * @param {Array.<object>=} options.arguments
+   *     Call arguments. All call arguments must belong to the same
+   *     JavaScript world as the target object.
+   * @param {boolean=} options.awaitPromise
+   *     Whether execution should `await` for resulting value
+   *     and return once awaited promise is resolved.
+   * @param {number=} options.executionContextId
+   *     Specifies execution context which global object will be used
+   *     to call function on. Either executionContextId or objectId
+   *     should be specified.
+   * @param {string=} options.objectId
+   *     Identifier of the object to call function on.
+   *     Either objectId or executionContextId should be specified.
+   * @param {boolean=} options.returnByValue
+   *     Whether the result is expected to be a JSON object
+   *     which should be sent by value.
+   *
+   * @returns {Object<RemoteObject, ExceptionDetails>}
+   */
+  callFunctionOn(options = {}) {
+    if (typeof options.functionDeclaration != "string") {
+      throw new TypeError("functionDeclaration: string value expected");
+    }
+    if (
+      typeof options.arguments != "undefined" &&
+      !Array.isArray(options.arguments)
+    ) {
+      throw new TypeError("arguments: array value expected");
+    }
+    if (!["undefined", "boolean"].includes(typeof options.awaitPromise)) {
+      throw new TypeError("awaitPromise: boolean value expected");
+    }
+    if (!["undefined", "number"].includes(typeof options.executionContextId)) {
+      throw new TypeError("executionContextId: number value expected");
+    }
+    if (!["undefined", "string"].includes(typeof options.objectId)) {
+      throw new TypeError("objectId: string value expected");
+    }
+    if (!["undefined", "boolean"].includes(typeof options.returnByValue)) {
+      throw new TypeError("returnByValue: boolean value expected");
+    }
+
+    if (
+      typeof options.executionContextId == "undefined" &&
+      typeof options.objectId == "undefined"
+    ) {
+      throw new Error(
+        "Either objectId or executionContextId must be specified"
+      );
+    }
+
+    let context = null;
+    // When an `objectId` is passed, we want to execute the function of a given object
+    // So we first have to find its ExecutionContext
+    if (options.objectId) {
+      for (const ctx of this.contexts.values()) {
+        if (ctx.hasRemoteObject(options.objectId)) {
+          context = ctx;
+          break;
+        }
+      }
+    } else {
+      context = this.contexts.get(options.executionContextId);
+    }
+
+    if (!context) {
+      throw new Error(ERROR_CONTEXT_NOT_FOUND);
+    }
+
+    return context.callFunctionOn(
+      options.functionDeclaration,
+      options.arguments,
+      options.returnByValue,
+      options.awaitPromise,
+      options.objectId
+    );
+  }
+
+  /**
+   * Evaluate expression on global object.
+   *
+   * @param {object} options
+   * @param {string} options.expression
+   *     Expression to evaluate.
+   * @param {boolean=} options.awaitPromise
+   *     Whether execution should `await` for resulting value
+   *     and return once awaited promise is resolved.
+   * @param {number=} options.contextId
+   *     Specifies in which execution context to perform evaluation.
+   *     If the parameter is omitted the evaluation will be performed
+   *     in the context of the inspected page.
+   * @param {boolean=} options.returnByValue
+   *     Whether the result is expected to be a JSON object
+   *     that should be sent by value. Defaults to false.
+   * @param {boolean=} options.userGesture [unsupported]
+   *     Whether execution should be treated as initiated by user in the UI.
+   *
+   * @returns {Object<RemoteObject, exceptionDetails>}
+   *     The evaluation result, and optionally exception details.
+   */
+  evaluate(options = {}) {
+    const {
+      expression,
+      awaitPromise = false,
+      contextId,
+      returnByValue = false,
+    } = options;
+
+    if (typeof expression != "string") {
+      throw new Error("expression: string value expected");
+    }
+    if (!["undefined", "boolean"].includes(typeof options.awaitPromise)) {
+      throw new TypeError("awaitPromise: boolean value expected");
+    }
+    if (typeof returnByValue != "boolean") {
+      throw new Error("returnByValue: boolean value expected");
+    }
+
+    let context;
+    if (typeof contextId != "undefined") {
+      context = this.contexts.get(contextId);
+      if (!context) {
+        throw new Error(ERROR_CONTEXT_NOT_FOUND);
+      }
+    } else {
+      context = this._getDefaultContextForWindow();
+    }
+
+    return context.evaluate(expression, awaitPromise, returnByValue);
+  }
+
+  getProperties(options = {}) {
+    const { objectId, ownProperties } = options;
+
+    for (const ctx of this.contexts.values()) {
+      const debuggerObj = ctx.getRemoteObject(objectId);
+      if (debuggerObj) {
+        return ctx.getProperties({ objectId, ownProperties });
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Internal methods: the following methods are not part of CDP;
+   * note the _ prefix.
+   */
+
+  get _debugger() {
+    if (this.__debugger) {
+      return this.__debugger;
+    }
+    this.__debugger = new Debugger();
+    return this.__debugger;
+  }
+
+  _buildExceptionStackTrace(stack) {
+    const callFrames = [];
+
+    while (
+      stack &&
+      stack.source !== "debugger eval code" &&
+      !stack.source.startsWith("chrome://")
+    ) {
+      callFrames.push({
+        functionName: stack.functionDisplayName,
+        scriptId: stack.sourceId.toString(),
+        url: stack.source,
+        lineNumber: stack.line - 1,
+        columnNumber: stack.column - 1,
+      });
+      stack = stack.parent || stack.asyncParent;
+    }
+
+    return {
+      callFrames,
+    };
+  }
+
+  _buildConsoleStackTrace(stack = []) {
+    const callFrames = stack
+      .filter(frame => !lazy.isChromeFrame(frame))
+      .map(frame => {
+        return {
+          functionName: frame.functionName,
+          scriptId: frame.sourceId.toString(),
+          url: frame.filename,
+          lineNumber: frame.lineNumber - 1,
+          columnNumber: frame.columnNumber - 1,
+        };
+      });
+
+    return {
+      callFrames,
+    };
+  }
+
+  _getRemoteObject(objectId) {
+    for (const ctx of this.contexts.values()) {
+      const debuggerObj = ctx.getRemoteObject(objectId);
+      if (debuggerObj) {
+        return debuggerObj;
+      }
+    }
+    return null;
+  }
+
+  _serializeRemoteObject(debuggerObj, executionContextId) {
+    const ctx = this.contexts.get(executionContextId);
+    return ctx._toRemoteObject(debuggerObj);
+  }
+
+  _getRemoteObjectByNodeId(nodeId, executionContextId) {
+    let debuggerObj = null;
+
+    if (typeof executionContextId != "undefined") {
+      const ctx = this.contexts.get(executionContextId);
+      debuggerObj = ctx.getRemoteObjectByNodeId(nodeId);
+    } else {
+      for (const ctx of this.contexts.values()) {
+        const obj = ctx.getRemoteObjectByNodeId(nodeId);
+        if (obj) {
+          debuggerObj = obj;
+          break;
+        }
+      }
+    }
+
+    return debuggerObj;
+  }
+
+  _setRemoteObject(debuggerObj, context) {
+    return context.setRemoteObject(debuggerObj);
+  }
+
+  _getDefaultContextForWindow(innerWindowId) {
+    if (!innerWindowId) {
+      innerWindowId = this.content.windowGlobalChild.innerWindowId;
+    }
+    const curContexts = this.innerWindowIdToContexts.get(innerWindowId);
+    if (curContexts) {
+      for (const ctx of curContexts) {
+        if (ctx.isDefault) {
+          return ctx;
+        }
+      }
+    }
+    return null;
+  }
+
+  _getContextsForFrame(frameId) {
+    const frameContexts = [];
+    for (const ctx of this.contexts.values()) {
+      if (ctx.frameId == frameId) {
+        frameContexts.push(ctx);
+      }
+    }
+    return frameContexts;
+  }
+
+  _emitConsoleAPICalled(payload) {
+    // Filter out messages that aren't coming from a valid inner window, or from
+    // a different browser tab. Also messages of type "time", which are not
+    // getting reported by Chrome.
+    const curBrowserId = this.session.browsingContext.browserId;
+    const win = Services.wm.getCurrentInnerWindowWithId(payload.innerWindowId);
+    if (
+      !win ||
+      BrowsingContext.getFromWindow(win).browserId != curBrowserId ||
+      payload.type === "time"
+    ) {
+      return;
+    }
+
+    const context = this._getDefaultContextForWindow();
+    this.emit("Runtime.consoleAPICalled", {
+      args: payload.arguments.map(arg => context._toRemoteObject(arg)),
+      executionContextId: context?.id || 0,
+      timestamp: payload.timestamp,
+      type: payload.type,
+      stackTrace: this._buildConsoleStackTrace(payload.stack),
+    });
+  }
+
+  _emitExceptionThrown(payload) {
+    // Filter out messages that aren't coming from a valid inner window, or from
+    // a different browser tab. Also messages of type "time", which are not
+    // getting reported by Chrome.
+    const curBrowserId = this.session.browsingContext.browserId;
+    const win = Services.wm.getCurrentInnerWindowWithId(payload.innerWindowId);
+    if (!win || BrowsingContext.getFromWindow(win).browserId != curBrowserId) {
+      return;
+    }
+
+    const context = this._getDefaultContextForWindow();
+    this.emit("Runtime.exceptionThrown", {
+      timestamp: payload.timestamp,
+      exceptionDetails: {
+        // Temporary placeholder to return a number.
+        exceptionId: 0,
+        text: payload.text,
+        lineNumber: payload.lineNumber,
+        columnNumber: payload.columnNumber,
+        url: payload.url,
+        stackTrace: this._buildExceptionStackTrace(payload.stack),
+        executionContextId: context?.id || undefined,
+      },
+    });
+  }
+
+  /**
+   * Helper method in order to instantiate the ExecutionContext for a given
+   * DOM Window as well as emitting the related
+   * `Runtime.executionContextCreated` event
+   *
+   * @param {string} name
+   *     Event name
+   * @param {object=} options
+   * @param {number} options.windowId
+   *     The inner window id of the newly instantiated document.
+   * @param {Window} options.window
+   *     The window object of the newly instantiated document.
+   * @param {string=} options.contextName
+   *     Human-readable name to describe the execution context.
+   * @param {boolean=} options.isDefault
+   *     Whether the execution context is the default one.
+   * @param {string=} options.contextType
+   *     "default" or "isolated"
+   *
+   * @returns {number} ID of created context
+   *
+   */
+  _onContextCreated(name, options = {}) {
+    const {
+      windowId,
+      window,
+      contextName = "",
+      isDefault = true,
+      contextType = "default",
+    } = options;
+
+    if (windowId === undefined) {
+      throw new Error("windowId is required");
+    }
+
+    // allow only one default context per inner window
+    if (isDefault && this.innerWindowIdToContexts.has(windowId)) {
+      for (const ctx of this.innerWindowIdToContexts.get(windowId)) {
+        if (ctx.isDefault) {
+          return null;
+        }
+      }
+    }
+
+    const context = new lazy.ExecutionContext(
+      this._debugger,
+      window,
+      this.innerWindowIdToContexts.count,
+      isDefault
+    );
+    this.contexts.set(context.id, context);
+    this.innerWindowIdToContexts.set(windowId, context);
+
+    if (this.enabled) {
+      this.emit("Runtime.executionContextCreated", {
+        context: {
+          id: context.id,
+          origin: window.origin,
+          name: contextName,
+          auxData: {
+            isDefault,
+            frameId: context.frameId,
+            type: contextType,
+          },
+        },
+      });
+    }
+
+    return context.id;
+  }
+
+  /**
+   * Helper method to destroy the ExecutionContext of the given id. Also emit
+   * the related `Runtime.executionContextDestroyed` and
+   * `Runtime.executionContextsCleared` events.
+   * ContextObserver will call this method with either `id` or `frameId` argument
+   * being set.
+   *
+   * @param {string} name
+   *     Event name
+   * @param {object=} options
+   * @param {number} options.id
+   *     The execution context id to destroy.
+   * @param {number} options.windowId
+   *     The inner-window id of the execution context to destroy.
+   * @param {number} options.frameId
+   *     The frame id of execution context to destroy.
+   * Either `id` or `frameId` or `windowId` is passed.
+   */
+  _onContextDestroyed(name, { id, frameId, windowId }) {
+    let contexts;
+    if ([id, frameId, windowId].filter(id => !!id).length > 1) {
+      throw new Error("Expects only *one* of id, frameId, windowId");
+    }
+
+    if (id) {
+      contexts = [this.contexts.get(id)];
+    } else if (frameId) {
+      contexts = this._getContextsForFrame(frameId);
+    } else {
+      contexts = this.innerWindowIdToContexts.get(windowId) || [];
+    }
+
+    for (const ctx of contexts) {
+      const isFrame = !!BrowsingContext.get(ctx.frameId).parent;
+
+      ctx.destructor();
+      this.contexts.delete(ctx.id);
+      this.innerWindowIdToContexts.get(ctx.windowId).delete(ctx);
+
+      if (this.enabled) {
+        this.emit("Runtime.executionContextDestroyed", {
+          executionContextId: ctx.id,
+        });
+      }
+
+      if (this.innerWindowIdToContexts.get(ctx.windowId).size == 0) {
+        this.innerWindowIdToContexts.delete(ctx.windowId);
+        // Only emit when all the exeuction contexts were cleared for the
+        // current browser / target, which means it should only be emitted
+        // for a top-level browsing context reference.
+        if (this.enabled && !isFrame) {
+          this.emit("Runtime.executionContextsCleared");
+        }
+      }
+    }
+  }
+
+  onConsoleLogEvent(message) {
+    // From sendConsoleAPIMessage (toolkit/modules/Console.sys.mjs)
+    this._emitConsoleAPICalled({
+      arguments: message.arguments,
+      innerWindowId: message.innerID,
+      stack: message.stacktrace,
+      timestamp: message.timeStamp,
+      type: CONSOLE_API_LEVEL_MAP[message.level] || message.level,
+    });
+  }
+
+  // nsIObserver
+
+  /**
+   * Takes a console message belonging to the current window and emits a
+   * "exceptionThrown" event if it's a Javascript error, otherwise a
+   * "consoleAPICalled" event.
+   *
+   * @param {nsIConsoleMessage} subject
+   *     Console message.
+   */
+  observe(subject, topic, data) {
+    if (subject instanceof Ci.nsIScriptError && subject.hasException) {
+      let entry = fromScriptError(subject);
+      this._emitExceptionThrown(entry);
+    }
+  }
+
+  // XPCOM
+
+  get QueryInterface() {
+    return ChromeUtils.generateQI(["nsIConsoleListener"]);
+  }
+}
+
+function fromScriptError(error) {
+  // From dom/bindings/nsIScriptError.idl
+  return {
+    innerWindowId: error.innerWindowID,
+    columnNumber: error.columnNumber - 1,
+    lineNumber: error.lineNumber - 1,
+    stack: error.stack,
+    text: error.errorMessage,
+    timestamp: error.timeStamp,
+    url: error.sourceName,
+  };
+}
diff --git a/remote/cdp/domains/content/Security.sys.mjs b/remote/cdp/domains/content/Security.sys.mjs
new file mode 100644
index 0000000000..7d21d386b4
--- /dev/null
+++ b/remote/cdp/domains/content/Security.sys.mjs
@@ -0,0 +1,32 @@
+/* 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/. */
+
+import { ContentProcessDomain } from "chrome://remote/content/cdp/domains/ContentProcessDomain.sys.mjs";
+
+export class Security extends ContentProcessDomain {
+  constructor(session) {
+    super(session);
+    this.enabled = false;
+  }
+
+  destructor() {
+    this.disable();
+
+    super.destructor();
+  }
+
+  // commands
+
+  async enable() {
+    if (!this.enabled) {
+      this.enabled = true;
+    }
+  }
+
+  disable() {
+    if (this.enabled) {
+      this.enabled = false;
+    }
+  }
+}
diff --git a/remote/cdp/domains/content/runtime/ExecutionContext.sys.mjs b/remote/cdp/domains/content/runtime/ExecutionContext.sys.mjs
new file mode 100644
index 0000000000..4d394f6bf9
--- /dev/null
+++ b/remote/cdp/domains/content/runtime/ExecutionContext.sys.mjs
@@ -0,0 +1,564 @@
+/* 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/. */
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  generateUUID: "chrome://remote/content/shared/UUID.sys.mjs",
+});
+
+const TYPED_ARRAY_CLASSES = [
+  "Uint8Array",
+  "Uint8ClampedArray",
+  "Uint16Array",
+  "Uint32Array",
+  "Int8Array",
+  "Int16Array",
+  "Int32Array",
+  "Float32Array",
+  "Float64Array",
+];
+
+// Bug 1786299: Puppeteer expects specific error messages.
+const ERROR_CYCLIC_REFERENCE = "Object reference chain is too long";
+const ERROR_CANNOT_RETURN_BY_VALUE = "Object couldn't be returned by value";
+
+function randomInt() {
+  return crypto.getRandomValues(new Uint32Array(1))[0];
+}
+
+/**
+ * This class represent a debuggable context onto which we can evaluate Javascript.
+ * This is typically a document, but it could also be a worker, an add-on, ... or
+ * any kind of context involving JS scripts.
+ *
+ * @param {Debugger} dbg
+ *   A Debugger instance that we can use to inspect the given global.
+ * @param {GlobalObject} debuggee
+ *   The debuggable context's global object. This is typically the document window
+ *   object. But it can also be any global object, like a worker global scope object.
+ */
+export class ExecutionContext {
+  constructor(dbg, debuggee, id, isDefault) {
+    this._debugger = dbg;
+    this._debuggee = this._debugger.addDebuggee(debuggee);
+
+    // Here, we assume that debuggee is a window object and we will propably have
+    // to adapt that once we cover workers or contexts that aren't a document.
+    this.window = debuggee;
+    this.windowId = this.window.windowGlobalChild.innerWindowId;
+    this.id = id;
+    this.frameId = this.window.browsingContext.id.toString();
+    this.isDefault = isDefault;
+
+    // objectId => Debugger.Object
+    this._remoteObjects = new Map();
+  }
+
+  destructor() {
+    this._debugger.removeDebuggee(this._debuggee);
+  }
+
+  get browsingContext() {
+    return this.window.browsingContext;
+  }
+
+  hasRemoteObject(objectId) {
+    return this._remoteObjects.has(objectId);
+  }
+
+  getRemoteObject(objectId) {
+    return this._remoteObjects.get(objectId);
+  }
+
+  getRemoteObjectByNodeId(nodeId) {
+    for (const value of this._remoteObjects.values()) {
+      if (value.nodeId == nodeId) {
+        return value;
+      }
+    }
+
+    return null;
+  }
+
+  releaseObject(objectId) {
+    return this._remoteObjects.delete(objectId);
+  }
+
+  /**
+   * Add a new debuggerObj to the object cache.
+   *
+   * Whenever an object is returned as reference, a new entry is added
+   * to the internal object cache. It means the same underlying object or node
+   * can be represented via multiple references.
+   */
+  setRemoteObject(debuggerObj) {
+    const objectId = lazy.generateUUID();
+
+    // TODO: Wrap Symbol into an object,
+    // which would allow us to set the objectId.
+    if (typeof debuggerObj == "object") {
+      debuggerObj.objectId = objectId;
+    }
+
+    // For node objects add an unique identifier.
+    if (
+      debuggerObj instanceof Debugger.Object &&
+      Node.isInstance(debuggerObj.unsafeDereference())
+    ) {
+      debuggerObj.nodeId = randomInt();
+      // We do not differentiate between backendNodeId and nodeId (yet)
+      debuggerObj.backendNodeId = debuggerObj.nodeId;
+    }
+
+    this._remoteObjects.set(objectId, debuggerObj);
+
+    return objectId;
+  }
+
+  /**
+   * Evaluate a Javascript expression.
+   *
+   * @param {string} expression
+   *   The JS expression to evaluate against the JS context.
+   * @param {boolean} awaitPromise
+   *     Whether execution should `await` for resulting value
+   *     and return once awaited promise is resolved.
+   * @param {boolean} returnByValue
+   *     Whether the result is expected to be a JSON object
+   *     that should be sent by value.
+   *
+   * @returns {object} A multi-form object depending if the execution
+   *   succeed or failed. If the expression failed to evaluate,
+   *   it will return an object with an `exceptionDetails` attribute
+   *   matching the `ExceptionDetails` CDP type. Otherwise it will
+   *   return an object with `result` attribute whose type is
+   *   `RemoteObject` CDP type.
+   */
+  async evaluate(expression, awaitPromise, returnByValue) {
+    let rv = this._debuggee.executeInGlobal(expression);
+    if (!rv) {
+      return {
+        exceptionDetails: {
+          text: "Evaluation terminated!",
+        },
+      };
+    }
+
+    if (rv.throw) {
+      return this._returnError(rv.throw);
+    }
+
+    let result = rv.return;
+
+    if (result && result.isPromise && awaitPromise) {
+      if (result.promiseState === "fulfilled") {
+        result = result.promiseValue;
+      } else if (result.promiseState === "rejected") {
+        return this._returnError(result.promiseReason);
+      } else {
+        try {
+          const promiseResult = await result.unsafeDereference();
+          result = this._debuggee.makeDebuggeeValue(promiseResult);
+        } catch (e) {
+          // The promise has been rejected
+          return this._returnError(this._debuggee.makeDebuggeeValue(e));
+        }
+      }
+    }
+
+    if (returnByValue) {
+      result = this._toRemoteObjectByValue(result);
+    } else {
+      result = this._toRemoteObject(result);
+    }
+
+    return { result };
+  }
+
+  /**
+   * Given a Debugger.Object reference for an Exception, return a JSON object
+   * describing the exception by following CDP ExceptionDetails specification.
+   */
+  _returnError(exception) {
+    if (
+      this._debuggee.executeInGlobalWithBindings("exception instanceof Error", {
+        exception,
+      }).return
+    ) {
+      const text = this._debuggee.executeInGlobalWithBindings(
+        "exception.message",
+        { exception }
+      ).return;
+      return {
+        exceptionDetails: {
+          text,
+        },
+      };
+    }
+
+    // If that isn't an Error, consider the exception as a JS value
+    return {
+      exceptionDetails: {
+        exception: this._toRemoteObject(exception),
+      },
+    };
+  }
+
+  async callFunctionOn(
+    functionDeclaration,
+    callArguments = [],
+    returnByValue = false,
+    awaitPromise = false,
+    objectId = null
+  ) {
+    // Map the given objectId to a JS reference.
+    let thisArg = null;
+    if (objectId) {
+      thisArg = this.getRemoteObject(objectId);
+      if (!thisArg) {
+        throw new Error(`Unable to get target object with id: ${objectId}`);
+      }
+    }
+
+    // First evaluate the function
+    const fun = this._debuggee.executeInGlobal("(" + functionDeclaration + ")");
+    if (!fun) {
+      return {
+        exceptionDetails: {
+          text: "Evaluation terminated!",
+        },
+      };
+    }
+    if (fun.throw) {
+      return this._returnError(fun.throw);
+    }
+
+    // Then map all input arguments, which are matching CDP's CallArguments type,
+    // into JS values
+    const args = callArguments.map(arg => this._fromCallArgument(arg));
+
+    // Finally, call the function with these arguments
+    const rv = fun.return.apply(thisArg, args);
+    if (rv.throw) {
+      return this._returnError(rv.throw);
+    }
+
+    let result = rv.return;
+
+    if (result && result.isPromise && awaitPromise) {
+      if (result.promiseState === "fulfilled") {
+        result = result.promiseValue;
+      } else if (result.promiseState === "rejected") {
+        return this._returnError(result.promiseReason);
+      } else {
+        try {
+          const promiseResult = await result.unsafeDereference();
+          result = this._debuggee.makeDebuggeeValue(promiseResult);
+        } catch (e) {
+          // The promise has been rejected
+          return this._returnError(this._debuggee.makeDebuggeeValue(e));
+        }
+      }
+    }
+
+    if (returnByValue) {
+      result = this._toRemoteObjectByValue(result);
+    } else {
+      result = this._toRemoteObject(result);
+    }
+
+    return { result };
+  }
+
+  getProperties({ objectId, ownProperties }) {
+    let debuggerObj = this.getRemoteObject(objectId);
+    if (!debuggerObj) {
+      throw new Error("Could not find object with given id");
+    }
+
+    const result = [];
+    const serializeObject = (debuggerObj, isOwn) => {
+      for (const propertyName of debuggerObj.getOwnPropertyNames()) {
+        const descriptor = debuggerObj.getOwnPropertyDescriptor(propertyName);
+        result.push({
+          name: propertyName,
+
+          configurable: descriptor.configurable,
+          enumerable: descriptor.enumerable,
+          writable: descriptor.writable,
+          value: this._toRemoteObject(descriptor.value),
+          get: descriptor.get
+            ? this._toRemoteObject(descriptor.get)
+            : undefined,
+          set: descriptor.set
+            ? this._toRemoteObject(descriptor.set)
+            : undefined,
+
+          isOwn,
+        });
+      }
+    };
+
+    // When `ownProperties` is set to true, we only iterate over own properties.
+    // Otherwise, we also iterate over propreties inherited from the prototype chain.
+    serializeObject(debuggerObj, true);
+
+    if (!ownProperties) {
+      while (true) {
+        debuggerObj = debuggerObj.proto;
+        if (!debuggerObj) {
+          break;
+        }
+        serializeObject(debuggerObj, false);
+      }
+    }
+
+    return {
+      result,
+    };
+  }
+
+  /**
+   * Given a CDP `CallArgument`, return a JS value that represent this argument.
+   * Note that `CallArgument` is actually very similar to `RemoteObject`
+   */
+  _fromCallArgument(arg) {
+    if (arg.objectId) {
+      if (!this.hasRemoteObject(arg.objectId)) {
+        throw new Error("Could not find object with given id");
+      }
+      return this.getRemoteObject(arg.objectId);
+    }
+
+    if (arg.unserializableValue) {
+      switch (arg.unserializableValue) {
+        case "-0":
+          return -0;
+        case "Infinity":
+          return Infinity;
+        case "-Infinity":
+          return -Infinity;
+        case "NaN":
+          return NaN;
+        default:
+          if (/^\d+n$/.test(arg.unserializableValue)) {
+            // eslint-disable-next-line no-undef
+            return BigInt(arg.unserializableValue.slice(0, -1));
+          }
+          throw new Error("Couldn't parse value object in call argument");
+      }
+    }
+
+    return this._deserialize(arg.value);
+  }
+
+  /**
+   * Given a JS value, create a copy of it within the debugee compartment.
+   */
+  _deserialize(obj) {
+    if (typeof obj !== "object") {
+      return obj;
+    }
+    const result = this._debuggee.executeInGlobalWithBindings(
+      "JSON.parse(obj)",
+      { obj: JSON.stringify(obj) }
+    );
+    if (result.throw) {
+      throw new Error("Unable to deserialize object");
+    }
+    return result.return;
+  }
+
+  /**
+   * Given a `Debugger.Object` object, return a JSON-serializable description of it
+   * matching `RemoteObject` CDP type.
+   *
+   * @param {Debugger.Object} debuggerObj
+   *  The object to serialize
+   * @returns {RemoteObject}
+   *  The serialized description of the given object
+   */
+  _toRemoteObject(debuggerObj) {
+    const result = {};
+
+    // First handle all non-primitive values which are going to be wrapped by the
+    // Debugger API into Debugger.Object instances
+    if (debuggerObj instanceof Debugger.Object) {
+      const rawObj = debuggerObj.unsafeDereference();
+
+      result.objectId = this.setRemoteObject(debuggerObj);
+      result.type = typeof rawObj;
+
+      // Map the Debugger API `class` attribute to CDP `subtype`
+      const cls = debuggerObj.class;
+      if (debuggerObj.isProxy) {
+        result.subtype = "proxy";
+      } else if (cls == "Array") {
+        result.subtype = "array";
+      } else if (cls == "RegExp") {
+        result.subtype = "regexp";
+      } else if (cls == "Date") {
+        result.subtype = "date";
+      } else if (cls == "Map") {
+        result.subtype = "map";
+      } else if (cls == "Set") {
+        result.subtype = "set";
+      } else if (cls == "WeakMap") {
+        result.subtype = "weakmap";
+      } else if (cls == "WeakSet") {
+        result.subtype = "weakset";
+      } else if (cls == "Error") {
+        result.subtype = "error";
+      } else if (cls == "Promise") {
+        result.subtype = "promise";
+      } else if (TYPED_ARRAY_CLASSES.includes(cls)) {
+        result.subtype = "typedarray";
+      } else if (Node.isInstance(rawObj)) {
+        result.subtype = "node";
+        result.className = ChromeUtils.getClassName(rawObj);
+        result.description = rawObj.localName || rawObj.nodeName;
+        if (rawObj.id) {
+          result.description += `#${rawObj.id}`;
+        }
+      }
+      return result;
+    }
+
+    // Now, handle all values that Debugger API isn't wrapping into Debugger.API.
+    // This is all the primitive JS types.
+    result.type = typeof debuggerObj;
+
+    // Symbol and BigInt are primitive values but aren't serializable.
+    // CDP expects them to be considered as objects, with an objectId to later inspect
+    // them.
+    if (result.type == "symbol") {
+      result.description = debuggerObj.toString();
+      result.objectId = this.setRemoteObject(debuggerObj);
+
+      return result;
+    }
+
+    // A few primitive type can't be serialized and CDP has special case for them
+    if (Object.is(debuggerObj, NaN)) {
+      result.unserializableValue = "NaN";
+    } else if (Object.is(debuggerObj, -0)) {
+      result.unserializableValue = "-0";
+    } else if (Object.is(debuggerObj, Infinity)) {
+      result.unserializableValue = "Infinity";
+    } else if (Object.is(debuggerObj, -Infinity)) {
+      result.unserializableValue = "-Infinity";
+    } else if (result.type == "bigint") {
+      result.unserializableValue = `${debuggerObj}n`;
+    }
+
+    if (result.unserializableValue) {
+      result.description = result.unserializableValue;
+      return result;
+    }
+
+    // Otherwise, we serialize the primitive values as-is via `value` attribute
+    result.value = debuggerObj;
+
+    // null is special as it has a dedicated subtype
+    if (debuggerObj === null) {
+      result.subtype = "null";
+    }
+
+    return result;
+  }
+
+  /**
+   * Given a `Debugger.Object` object, return a JSON-serializable description of it
+   * matching `RemoteObject` CDP type.
+   *
+   * @param {Debugger.Object} debuggerObj
+   *  The object to serialize
+   * @returns {RemoteObject}
+   *  The serialized description of the given object
+   */
+  _toRemoteObjectByValue(debuggerObj) {
+    const type = typeof debuggerObj;
+
+    if (type == "undefined") {
+      return { type };
+    }
+
+    let unserializableValue;
+    if (Object.is(debuggerObj, -0)) {
+      unserializableValue = "-0";
+    } else if (Object.is(debuggerObj, NaN)) {
+      unserializableValue = "NaN";
+    } else if (Object.is(debuggerObj, Infinity)) {
+      unserializableValue = "Infinity";
+    } else if (Object.is(debuggerObj, -Infinity)) {
+      unserializableValue = "-Infinity";
+    } else if (typeof debuggerObj == "bigint") {
+      unserializableValue = `${debuggerObj}n`;
+    }
+
+    if (unserializableValue) {
+      return {
+        type,
+        unserializableValue,
+        description: unserializableValue,
+      };
+    }
+
+    const value = this._serialize(debuggerObj);
+    return {
+      type: typeof value,
+      value,
+      description: value != null ? value.toString() : value,
+    };
+  }
+
+  /**
+   * Convert a given `Debugger.Object` to an object.
+   *
+   * @param {Debugger.Object} debuggerObj
+   *  The object to convert
+   *
+   * @returns {object}
+   *  The converted object
+   */
+  _serialize(debuggerObj) {
+    const result = this._debuggee.executeInGlobalWithBindings(
+      `
+      JSON.stringify(e, (key, value) => {
+        if (typeof value === "symbol") {
+          // CDP cannot return Symbols
+          throw new Error();
+        }
+
+        return value;
+      });
+    `,
+      { e: debuggerObj }
+    );
+    if (result.throw) {
+      const exception = this._toRawObject(result.throw);
+      if (exception.message === "cyclic object value") {
+        throw new Error(ERROR_CYCLIC_REFERENCE);
+      }
+
+      throw new Error(ERROR_CANNOT_RETURN_BY_VALUE);
+    }
+
+    return JSON.parse(result.return);
+  }
+
+  _toRawObject(maybeDebuggerObject) {
+    if (maybeDebuggerObject instanceof Debugger.Object) {
+      // Retrieve the referent for the provided Debugger.object.
+      // See https://firefox-source-docs.mozilla.org/devtools-user/debugger-api/debugger.object/index.html
+      const rawObject = maybeDebuggerObject.unsafeDereference();
+      return Cu.waiveXrays(rawObject);
+    }
+
+    // If maybeDebuggerObject was not a Debugger.Object, it is a primitive value
+    // which can be used as is.
+    return maybeDebuggerObject;
+  }
+}