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diff --git a/devtools/server/actors/targets/parent-process.js b/devtools/server/actors/targets/parent-process.js
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+++ b/devtools/server/actors/targets/parent-process.js
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+/* 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 the entire parent process.
+ *
+ * This actor extends WindowGlobalTargetActor.
+ * This actor is extended by WebExtensionTargetActor.
+ *
+ * See devtools/docs/backend/actor-hierarchy.md for more details.
+ */
+
+const {
+  DevToolsServer,
+} = require("resource://devtools/server/devtools-server.js");
+const {
+  getChildDocShells,
+  WindowGlobalTargetActor,
+} = require("resource://devtools/server/actors/targets/window-global.js");
+const makeDebugger = require("resource://devtools/server/actors/utils/make-debugger.js");
+
+const {
+  parentProcessTargetSpec,
+} = require("resource://devtools/shared/specs/targets/parent-process.js");
+
+class ParentProcessTargetActor extends WindowGlobalTargetActor {
+  /**
+   * Creates a target actor for debugging all the chrome content in the parent process.
+   * Most of the implementation is inherited from WindowGlobalTargetActor.
+   * ParentProcessTargetActor is a child of RootActor, it can be instantiated via
+   * RootActor.getProcess request. ParentProcessTargetActor exposes all target-scoped actors
+   * via its form() request, like WindowGlobalTargetActor.
+   *
+   * @param conn DevToolsServerConnection
+   *        The connection to the client.
+   * @param {Object} options
+   *        - isTopLevelTarget: {Boolean} flag to indicate if this is the top
+   *          level target of the DevTools session
+   *        - sessionContext Object
+   *          The Session Context to help know what is debugged.
+   *          See devtools/server/actors/watcher/session-context.js
+   *        - customSpec Object
+   *          WebExtensionTargetActor inherits from ParentProcessTargetActor
+   *          and has to use its own protocol.js specification object.
+   */
+  constructor(
+    conn,
+    { isTopLevelTarget, sessionContext, customSpec = parentProcessTargetSpec }
+  ) {
+    super(conn, {
+      isTopLevelTarget,
+      sessionContext,
+      customSpec,
+    });
+
+    // This creates a Debugger instance for chrome debugging all globals.
+    this.makeDebugger = makeDebugger.bind(null, {
+      findDebuggees: dbg => dbg.findAllGlobals(),
+      shouldAddNewGlobalAsDebuggee: () => true,
+    });
+
+    // Ensure catching the creation of any new content docshell
+    this.watchNewDocShells = true;
+
+    this.isRootActor = true;
+
+    // Listen for any new/destroyed chrome docshell
+    Services.obs.addObserver(this, "chrome-webnavigation-create");
+    Services.obs.addObserver(this, "chrome-webnavigation-destroy");
+
+    // If we are the parent process target actor and not a subclass
+    // (i.e. if we aren't the webext target actor)
+    // set the parent process docshell:
+    if (customSpec == parentProcessTargetSpec) {
+      this.setDocShell(this._getInitialDocShell());
+    }
+  }
+
+  // Overload setDocShell in order to observe all the docshells.
+  // WindowGlobalTargetActor only observes the top level one,
+  // but we also need to observe all of them for WebExtensionTargetActor subclass.
+  setDocShell(initialDocShell) {
+    super.setDocShell(initialDocShell);
+
+    // Iterate over all top-level windows.
+    for (const { docShell } of Services.ww.getWindowEnumerator()) {
+      if (docShell == this.docShell) {
+        continue;
+      }
+      this._progressListener.watch(docShell);
+    }
+  }
+
+  _getInitialDocShell() {
+    // Defines the default docshell selected for the target actor
+    let window = Services.wm.getMostRecentWindow(
+      DevToolsServer.chromeWindowType
+    );
+
+    // Default to any available top level window if there is no expected window
+    // eg when running ./mach run --chrome chrome://browser/content/aboutTabCrashed.xhtml --jsdebugger
+    if (!window) {
+      window = Services.wm.getMostRecentWindow(null);
+    }
+
+    // We really want _some_ window at least, so fallback to the hidden window if
+    // there's nothing else (such as during early startup).
+    if (!window) {
+      window = Services.appShell.hiddenDOMWindow;
+    }
+    return window.docShell;
+  }
+
+  /**
+   * Getter for the list of all docshells in this targetActor
+   * @return {Array}
+   */
+  get docShells() {
+    // Iterate over all top-level windows and all their docshells.
+    let docShells = [];
+    for (const { docShell } of Services.ww.getWindowEnumerator()) {
+      docShells = docShells.concat(getChildDocShells(docShell));
+    }
+
+    return docShells;
+  }
+
+  observe(subject, topic, data) {
+    super.observe(subject, topic, data);
+    if (this.isDestroyed()) {
+      return;
+    }
+
+    subject.QueryInterface(Ci.nsIDocShell);
+
+    if (topic == "chrome-webnavigation-create") {
+      this._onDocShellCreated(subject);
+    } else if (topic == "chrome-webnavigation-destroy") {
+      this._onDocShellDestroy(subject);
+    }
+  }
+
+  _detach() {
+    if (this.isDestroyed()) {
+      return false;
+    }
+
+    Services.obs.removeObserver(this, "chrome-webnavigation-create");
+    Services.obs.removeObserver(this, "chrome-webnavigation-destroy");
+
+    // Iterate over all top-level windows.
+    for (const { docShell } of Services.ww.getWindowEnumerator()) {
+      if (docShell == this.docShell) {
+        continue;
+      }
+      this._progressListener.unwatch(docShell);
+    }
+
+    return super._detach();
+  }
+}
+
+exports.ParentProcessTargetActor = ParentProcessTargetActor;