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diff --git a/remote/shared/WindowManager.sys.mjs b/remote/shared/WindowManager.sys.mjs
new file mode 100644
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+++ b/remote/shared/WindowManager.sys.mjs
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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/. */
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  AppInfo: "chrome://remote/content/shared/AppInfo.sys.mjs",
+  error: "chrome://remote/content/shared/webdriver/Errors.sys.mjs",
+  EventPromise: "chrome://remote/content/shared/Sync.sys.mjs",
+  generateUUID: "chrome://remote/content/shared/UUID.sys.mjs",
+  TabManager: "chrome://remote/content/shared/TabManager.sys.mjs",
+  TimedPromise: "chrome://remote/content/marionette/sync.sys.mjs",
+  waitForObserverTopic: "chrome://remote/content/marionette/sync.sys.mjs",
+});
+
+/**
+ * Provides helpers to interact with Window objects.
+ *
+ * @class WindowManager
+ */
+class WindowManager {
+  constructor() {
+    // Maps ChromeWindow to uuid: WeakMap.<Object, string>
+    this._chromeWindowHandles = new WeakMap();
+  }
+
+  get chromeWindowHandles() {
+    const chromeWindowHandles = [];
+
+    for (const win of this.windows) {
+      chromeWindowHandles.push(this.getIdForWindow(win));
+    }
+
+    return chromeWindowHandles;
+  }
+
+  get windows() {
+    return Services.wm.getEnumerator(null);
+  }
+
+  /**
+   * Find a specific window matching the provided window handle.
+   *
+   * @param {string} handle
+   *     The unique handle of either a chrome window or a content browser, as
+   *     returned by :js:func:`#getIdForBrowser` or :js:func:`#getIdForWindow`.
+   *
+   * @returns {object} A window properties object,
+   *     @see :js:func:`GeckoDriver#getWindowProperties`
+   */
+  findWindowByHandle(handle) {
+    for (const win of this.windows) {
+      // In case the wanted window is a chrome window, we are done.
+      const chromeWindowId = this.getIdForWindow(win);
+      if (chromeWindowId == handle) {
+        return this.getWindowProperties(win);
+      }
+
+      // Otherwise check if the chrome window has a tab browser, and that it
+      // contains a tab with the wanted window handle.
+      const tabBrowser = lazy.TabManager.getTabBrowser(win);
+      if (tabBrowser && tabBrowser.tabs) {
+        for (let i = 0; i < tabBrowser.tabs.length; ++i) {
+          let contentBrowser = lazy.TabManager.getBrowserForTab(
+            tabBrowser.tabs[i]
+          );
+          let contentWindowId = lazy.TabManager.getIdForBrowser(contentBrowser);
+
+          if (contentWindowId == handle) {
+            return this.getWindowProperties(win, { tabIndex: i });
+          }
+        }
+      }
+    }
+
+    return null;
+  }
+
+  /**
+   * A set of properties describing a window and that should allow to uniquely
+   * identify it. The described window can either be a Chrome Window or a
+   * Content Window.
+   *
+   * @typedef {object} WindowProperties
+   * @property {Window} win - The Chrome Window containing the window.
+   *     When describing a Chrome Window, this is the window itself.
+   * @property {string} id - The unique id of the containing Chrome Window.
+   * @property {boolean} hasTabBrowser - `true` if the Chrome Window has a
+   *     tabBrowser.
+   * @property {number} tabIndex - Optional, the index of the specific tab
+   *     within the window.
+   */
+
+  /**
+   * Returns a WindowProperties object, that can be used with :js:func:`GeckoDriver#setWindowHandle`.
+   *
+   * @param {Window} win
+   *     The Chrome Window for which we want to create a properties object.
+   * @param {object} options
+   * @param {number} options.tabIndex
+   *     Tab index of a specific Content Window in the specified Chrome Window.
+   * @returns {WindowProperties} A window properties object.
+   */
+  getWindowProperties(win, options = {}) {
+    if (!Window.isInstance(win)) {
+      throw new TypeError("Invalid argument, expected a Window object");
+    }
+
+    return {
+      win,
+      id: this.getIdForWindow(win),
+      hasTabBrowser: !!lazy.TabManager.getTabBrowser(win),
+      tabIndex: options.tabIndex,
+    };
+  }
+
+  /**
+   * Retrieves an id for the given chrome window. The id is a dynamically
+   * generated uuid associated with the window object.
+   *
+   * @param {window} win
+   *     The window object for which we want to retrieve the id.
+   * @returns {string} The unique id for this chrome window.
+   */
+  getIdForWindow(win) {
+    if (!this._chromeWindowHandles.has(win)) {
+      this._chromeWindowHandles.set(win, lazy.generateUUID());
+    }
+    return this._chromeWindowHandles.get(win);
+  }
+
+  /**
+   * Close the specified window.
+   *
+   * @param {window} win
+   *     The window to close.
+   * @returns {Promise}
+   *     A promise which is resolved when the current window has been closed.
+   */
+  async closeWindow(win) {
+    const destroyed = lazy.waitForObserverTopic("xul-window-destroyed", {
+      checkFn: () => win && win.closed,
+    });
+
+    win.close();
+
+    return destroyed;
+  }
+
+  /**
+   * Focus the specified window.
+   *
+   * @param {window} win
+   *     The window to focus.
+   * @returns {Promise}
+   *     A promise which is resolved when the window has been focused.
+   */
+  async focusWindow(win) {
+    if (Services.focus.activeWindow != win) {
+      let activated = new lazy.EventPromise(win, "activate");
+      let focused = new lazy.EventPromise(win, "focus", { capture: true });
+
+      win.focus();
+
+      await Promise.all([activated, focused]);
+    }
+  }
+
+  /**
+   * Open a new browser window.
+   *
+   * @param {object=} options
+   * @param {boolean=} options.focus
+   *     If true, the opened window will receive the focus. Defaults to false.
+   * @param {boolean=} options.isPrivate
+   *     If true, the opened window will be a private window. Defaults to false.
+   * @param {ChromeWindow=} options.openerWindow
+   *     Use this window as the opener of the new window. Defaults to the
+   *     topmost window.
+   * @returns {Promise}
+   *     A promise resolving to the newly created chrome window.
+   */
+  async openBrowserWindow(options = {}) {
+    let { focus = false, isPrivate = false, openerWindow = null } = options;
+
+    switch (lazy.AppInfo.name) {
+      case "Firefox":
+        if (openerWindow === null) {
+          // If no opener was provided, fallback to the topmost window.
+          openerWindow = Services.wm.getMostRecentBrowserWindow();
+        }
+
+        if (!openerWindow) {
+          throw new lazy.error.UnsupportedOperationError(
+            `openWindow() could not find a valid opener window`
+          );
+        }
+
+        // Open new browser window, and wait until it is fully loaded.
+        // Also wait for the window to be focused and activated to prevent a
+        // race condition when promptly focusing to the original window again.
+        const win = openerWindow.OpenBrowserWindow({ private: isPrivate });
+
+        const activated = new lazy.EventPromise(win, "activate");
+        const focused = new lazy.EventPromise(win, "focus", { capture: true });
+        const startup = lazy.waitForObserverTopic(
+          "browser-delayed-startup-finished",
+          {
+            checkFn: subject => subject == win,
+          }
+        );
+
+        // TODO: Both for WebDriver BiDi and classic, opening a new window
+        // should not run the focus steps. When focus is false we should avoid
+        // focusing the new window completely. See Bug 1766329
+        win.focus();
+
+        await Promise.all([activated, focused, startup]);
+
+        // The new window shouldn't get focused. As such set the
+        // focus back to the opening window.
+        if (!focus) {
+          await this.focusWindow(openerWindow);
+        }
+
+        return win;
+
+      default:
+        throw new lazy.error.UnsupportedOperationError(
+          `openWindow() not supported in ${lazy.AppInfo.name}`
+        );
+    }
+  }
+
+  /**
+   * Wait until the initial application window has been opened and loaded.
+   *
+   * @returns {Promise<WindowProxy>}
+   *     A promise that resolved to the application window.
+   */
+  waitForInitialApplicationWindowLoaded() {
+    return new lazy.TimedPromise(
+      async resolve => {
+        // This call includes a fallback to "mail3:pane" as well.
+        const win = Services.wm.getMostRecentBrowserWindow();
+
+        const windowLoaded = lazy.waitForObserverTopic(
+          "browser-delayed-startup-finished",
+          {
+            checkFn: subject => (win !== null ? subject == win : true),
+          }
+        );
+
+        // The current window has already been finished loading.
+        if (win && win.document.readyState == "complete") {
+          resolve(win);
+          return;
+        }
+
+        // Wait for the next browser/mail window to open and finished loading.
+        const { subject } = await windowLoaded;
+        resolve(subject);
+      },
+      {
+        errorMessage: "No applicable application window found",
+      }
+    );
+  }
+}
+
+// Expose a shared singleton.
+export const windowManager = new WindowManager();