Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 967 insertions, 0 deletions

diff --git a/browser/base/content/browser-fullScreenAndPointerLock.js b/browser/base/content/browser-fullScreenAndPointerLock.js
new file mode 100644
index 0000000000..29183138c7
--- /dev/null
+++ b/browser/base/content/browser-fullScreenAndPointerLock.js
@@ -0,0 +1,967 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This file is loaded into the browser window scope.
+/* eslint-env mozilla/browser-window */
+
+var PointerlockFsWarning = {
+  _element: null,
+  _origin: null,
+
+  /**
+   * Timeout object for managing timeout request. If it is started when
+   * the previous call hasn't finished, it would automatically cancelled
+   * the previous one.
+   */
+  Timeout: class {
+    constructor(func, delay) {
+      this._id = 0;
+      this._func = func;
+      this._delay = delay;
+    }
+    start() {
+      this.cancel();
+      this._id = setTimeout(() => this._handle(), this._delay);
+    }
+    cancel() {
+      if (this._id) {
+        clearTimeout(this._id);
+        this._id = 0;
+      }
+    }
+    _handle() {
+      this._id = 0;
+      this._func();
+    }
+    get delay() {
+      return this._delay;
+    }
+  },
+
+  showPointerLock(aOrigin) {
+    if (!document.fullscreen) {
+      let timeout = Services.prefs.getIntPref(
+        "pointer-lock-api.warning.timeout"
+      );
+      this.show(aOrigin, "pointerlock-warning", timeout, 0);
+    }
+  },
+
+  showFullScreen(aOrigin) {
+    let timeout = Services.prefs.getIntPref("full-screen-api.warning.timeout");
+    let delay = Services.prefs.getIntPref("full-screen-api.warning.delay");
+    this.show(aOrigin, "fullscreen-warning", timeout, delay);
+  },
+
+  // Shows a warning that the site has entered fullscreen or
+  // pointer lock for a short duration.
+  show(aOrigin, elementId, timeout, delay) {
+    if (!this._element) {
+      this._element = document.getElementById(elementId);
+      // Setup event listeners
+      this._element.addEventListener("transitionend", this);
+      this._element.addEventListener("transitioncancel", this);
+      window.addEventListener("mousemove", this, true);
+      // If the user explicitly disables the prompt, there's no need to detect
+      // activation.
+      if (timeout > 0) {
+        window.addEventListener("activate", this);
+        window.addEventListener("deactivate", this);
+      }
+      // The timeout to hide the warning box after a while.
+      this._timeoutHide = new this.Timeout(() => {
+        window.removeEventListener("activate", this);
+        window.removeEventListener("deactivate", this);
+        this._state = "hidden";
+      }, timeout);
+      // The timeout to show the warning box when the pointer is at the top
+      this._timeoutShow = new this.Timeout(() => {
+        this._state = "ontop";
+        this._timeoutHide.start();
+      }, delay);
+    }
+
+    // Set the strings on the warning UI.
+    if (aOrigin) {
+      this._origin = aOrigin;
+    }
+    let uri = Services.io.newURI(this._origin);
+    let host = null;
+    // Make an exception for PDF.js - we'll show "This document" instead.
+    if (this._origin != "resource://pdf.js") {
+      try {
+        host = uri.host;
+      } catch (e) {}
+    }
+    let textElem = this._element.querySelector(
+      ".pointerlockfswarning-domain-text"
+    );
+    if (!host) {
+      textElem.hidden = true;
+    } else {
+      textElem.removeAttribute("hidden");
+      // Document's principal's URI has a host. Display a warning including it.
+      let { DownloadUtils } = ChromeUtils.importESModule(
+        "resource://gre/modules/DownloadUtils.sys.mjs"
+      );
+      let displayHost = DownloadUtils.getURIHost(uri.spec)[0];
+      let l10nString = {
+        "fullscreen-warning": "fullscreen-warning-domain",
+        "pointerlock-warning": "pointerlock-warning-domain",
+      }[elementId];
+      document.l10n.setAttributes(textElem, l10nString, {
+        domain: displayHost,
+      });
+    }
+
+    this._element.dataset.identity =
+      gIdentityHandler.pointerlockFsWarningClassName;
+
+    // User should be allowed to explicitly disable
+    // the prompt if they really want.
+    if (this._timeoutHide.delay <= 0) {
+      return;
+    }
+
+    if (Services.focus.activeWindow == window) {
+      this._state = "onscreen";
+      this._timeoutHide.start();
+    }
+  },
+
+  /**
+   * Close the full screen or pointerlock warning.
+   * @param {('fullscreen-warning'|'pointerlock-warning')} elementId - Id of the
+   * warning element to close. If the id does not match the currently shown
+   * warning this is a no-op.
+   */
+  close(elementId) {
+    if (!elementId) {
+      throw new Error("Must pass id of warning element to close");
+    }
+    if (!this._element || this._element.id != elementId) {
+      return;
+    }
+    // Cancel any pending timeout
+    this._timeoutHide.cancel();
+    this._timeoutShow.cancel();
+    // Reset state of the warning box
+    this._state = "hidden";
+    // Reset state of the text so we don't persist or retranslate it.
+    this._element
+      .querySelector(".pointerlockfswarning-domain-text")
+      .removeAttribute("data-l10n-id");
+    this._element.hidden = true;
+    // Remove all event listeners
+    this._element.removeEventListener("transitionend", this);
+    this._element.removeEventListener("transitioncancel", this);
+    window.removeEventListener("mousemove", this, true);
+    window.removeEventListener("activate", this);
+    window.removeEventListener("deactivate", this);
+    // Clear fields
+    this._element = null;
+    this._timeoutHide = null;
+    this._timeoutShow = null;
+
+    // Ensure focus switches away from the (now hidden) warning box.
+    // If the user clicked buttons in the warning box, it would have
+    // been focused, and any key events would be directed at the (now
+    // hidden) chrome document instead of the target document.
+    gBrowser.selectedBrowser.focus();
+  },
+
+  // State could be one of "onscreen", "ontop", "hiding", and
+  // "hidden". Setting the state to "onscreen" and "ontop" takes
+  // effect immediately, while setting it to "hidden" actually
+  // turns the state to "hiding" before the transition finishes.
+  _lastState: null,
+  _STATES: ["hidden", "ontop", "onscreen"],
+  get _state() {
+    for (let state of this._STATES) {
+      if (this._element.hasAttribute(state)) {
+        return state;
+      }
+    }
+    return "hiding";
+  },
+  set _state(newState) {
+    let currentState = this._state;
+    if (currentState == newState) {
+      return;
+    }
+    if (currentState != "hiding") {
+      this._lastState = currentState;
+      this._element.removeAttribute(currentState);
+    }
+    if (newState != "hidden") {
+      if (currentState != "hidden") {
+        this._element.setAttribute(newState, "");
+      } else {
+        // When the previous state is hidden, the display was none,
+        // thus no box was constructed. We need to wait for the new
+        // display value taking effect first, otherwise, there won't
+        // be any transition. Since requestAnimationFrame callback is
+        // generally triggered before any style flush and layout, we
+        // should wait for the second animation frame.
+        requestAnimationFrame(() => {
+          requestAnimationFrame(() => {
+            if (this._element) {
+              this._element.setAttribute(newState, "");
+            }
+          });
+        });
+      }
+    }
+  },
+
+  handleEvent(event) {
+    switch (event.type) {
+      case "mousemove": {
+        let state = this._state;
+        if (state == "hidden") {
+          // If the warning box is currently hidden, show it after
+          // a short delay if the pointer is at the top.
+          if (event.clientY != 0) {
+            this._timeoutShow.cancel();
+          } else if (this._timeoutShow.delay >= 0) {
+            this._timeoutShow.start();
+          }
+        } else if (state != "onscreen") {
+          let elemRect = this._element.getBoundingClientRect();
+          if (state == "hiding" && this._lastState != "hidden") {
+            // If we are on the hiding transition, and the pointer
+            // moved near the box, restore to the previous state.
+            if (event.clientY <= elemRect.bottom + 50) {
+              this._state = this._lastState;
+              this._timeoutHide.start();
+            }
+          } else if (state == "ontop" || this._lastState != "hidden") {
+            // State being "ontop" or the previous state not being
+            // "hidden" indicates this current warning box is shown
+            // in response to user's action. Hide it immediately when
+            // the pointer leaves that area.
+            if (event.clientY > elemRect.bottom + 50) {
+              this._state = "hidden";
+              this._timeoutHide.cancel();
+            }
+          }
+        }
+        break;
+      }
+      case "transitionend":
+      case "transitioncancel": {
+        if (this._state == "hiding") {
+          this._element.hidden = true;
+        }
+        break;
+      }
+      case "activate": {
+        this._state = "onscreen";
+        this._timeoutHide.start();
+        break;
+      }
+      case "deactivate": {
+        this._state = "hidden";
+        this._timeoutHide.cancel();
+        break;
+      }
+    }
+  },
+};
+
+var PointerLock = {
+  entered(originNoSuffix) {
+    PointerlockFsWarning.showPointerLock(originNoSuffix);
+  },
+
+  exited() {
+    PointerlockFsWarning.close("pointerlock-warning");
+  },
+};
+
+var FullScreen = {
+  init() {
+    XPCOMUtils.defineLazyPreferenceGetter(
+      this,
+      "permissionsFullScreenAllowed",
+      "permissions.fullscreen.allowed"
+    );
+
+    // Called when the Firefox window go into fullscreen.
+    addEventListener("fullscreen", this, true);
+
+    // Called only when fullscreen is requested
+    // by the parent (eg: via the browser-menu).
+    // Should not be called when the request comes from
+    // the content.
+    addEventListener("willenterfullscreen", this, true);
+    addEventListener("willexitfullscreen", this, true);
+    addEventListener("MacFullscreenMenubarRevealUpdate", this, true);
+
+    if (window.fullScreen) {
+      this.toggle();
+    }
+  },
+
+  uninit() {
+    this.cleanup();
+  },
+
+  willToggle(aWillEnterFullscreen) {
+    if (aWillEnterFullscreen) {
+      document.documentElement.setAttribute("inFullscreen", true);
+    } else {
+      document.documentElement.removeAttribute("inFullscreen");
+    }
+  },
+
+  get fullScreenToggler() {
+    delete this.fullScreenToggler;
+    return (this.fullScreenToggler =
+      document.getElementById("fullscr-toggler"));
+  },
+
+  toggle() {
+    var enterFS = window.fullScreen;
+
+    // Toggle the View:FullScreen command, which controls elements like the
+    // fullscreen menuitem, and menubars.
+    let fullscreenCommand = document.getElementById("View:FullScreen");
+    if (enterFS) {
+      fullscreenCommand.setAttribute("checked", enterFS);
+    } else {
+      fullscreenCommand.removeAttribute("checked");
+    }
+
+    if (AppConstants.platform == "macosx") {
+      // Make sure the menu items are adjusted.
+      document.getElementById("enterFullScreenItem").hidden = enterFS;
+      document.getElementById("exitFullScreenItem").hidden = !enterFS;
+      this.shiftMacToolbarDown(0);
+    }
+
+    let fstoggler = this.fullScreenToggler;
+    fstoggler.addEventListener("mouseover", this._expandCallback);
+    fstoggler.addEventListener("dragenter", this._expandCallback);
+    fstoggler.addEventListener("touchmove", this._expandCallback, {
+      passive: true,
+    });
+
+    if (enterFS) {
+      gNavToolbox.setAttribute("inFullscreen", true);
+      document.documentElement.setAttribute("inFullscreen", true);
+      let alwaysUsesNativeFullscreen =
+        AppConstants.platform == "macosx" &&
+        Services.prefs.getBoolPref("full-screen-api.macos-native-full-screen");
+      if (
+        (alwaysUsesNativeFullscreen || !document.fullscreenElement) &&
+        AppConstants.platform == "macosx"
+      ) {
+        document.documentElement.setAttribute("macOSNativeFullscreen", true);
+      }
+    } else {
+      gNavToolbox.removeAttribute("inFullscreen");
+      document.documentElement.removeAttribute("inFullscreen");
+      document.documentElement.removeAttribute("macOSNativeFullscreen");
+    }
+
+    if (!document.fullscreenElement) {
+      this._updateToolbars(enterFS);
+    }
+
+    if (enterFS) {
+      document.addEventListener("keypress", this._keyToggleCallback);
+      document.addEventListener("popupshown", this._setPopupOpen);
+      document.addEventListener("popuphidden", this._setPopupOpen);
+      gURLBar.controller.addQueryListener(this);
+
+      // In DOM fullscreen mode, we hide toolbars with CSS
+      if (!document.fullscreenElement) {
+        this.hideNavToolbox(true);
+      }
+    } else {
+      this.showNavToolbox(false);
+      // This is needed if they use the context menu to quit fullscreen
+      this._isPopupOpen = false;
+      this.cleanup();
+    }
+    this._toggleShortcutKeys();
+  },
+
+  exitDomFullScreen() {
+    if (document.fullscreen) {
+      document.exitFullscreen();
+    }
+  },
+
+  /**
+   * Shifts the browser toolbar down when it is moused over on macOS in
+   * fullscreen.
+   * @param {number} shiftSize
+   *   A distance, in pixels, by which to shift the browser toolbar down.
+   */
+  shiftMacToolbarDown(shiftSize) {
+    if (typeof shiftSize !== "number") {
+      console.error("Tried to shift the toolbar by a non-numeric distance.");
+      return;
+    }
+
+    // shiftSize is sent from Cocoa widget code as a very precise double. We
+    // don't need that kind of precision in our CSS.
+    shiftSize = shiftSize.toFixed(2);
+    let toolbox = document.getElementById("navigator-toolbox");
+    if (shiftSize > 0) {
+      toolbox.style.setProperty("transform", `translateY(${shiftSize}px)`);
+      toolbox.style.setProperty("z-index", "2");
+    } else {
+      toolbox.style.removeProperty("transform");
+      toolbox.style.removeProperty("z-index");
+    }
+  },
+
+  handleEvent(event) {
+    switch (event.type) {
+      case "willenterfullscreen":
+        this.willToggle(true);
+        break;
+      case "willexitfullscreen":
+        this.willToggle(false);
+        break;
+      case "fullscreen":
+        this.toggle();
+        break;
+      case "MacFullscreenMenubarRevealUpdate":
+        this.shiftMacToolbarDown(event.detail);
+        break;
+    }
+  },
+
+  _logWarningPermissionPromptFS(actionStringKey) {
+    let consoleMsg = Cc["@mozilla.org/scripterror;1"].createInstance(
+      Ci.nsIScriptError
+    );
+    let message = gBrowserBundle.GetStringFromName(
+      `permissions.fullscreen.${actionStringKey}`
+    );
+    consoleMsg.initWithWindowID(
+      message,
+      gBrowser.currentURI.spec,
+      null,
+      0,
+      0,
+      Ci.nsIScriptError.warningFlag,
+      "FullScreen",
+      gBrowser.selectedBrowser.innerWindowID
+    );
+    Services.console.logMessage(consoleMsg);
+  },
+
+  _handlePermPromptShow() {
+    if (
+      !FullScreen.permissionsFullScreenAllowed &&
+      window.fullScreen &&
+      PopupNotifications.getNotification(
+        this._permissionNotificationIDs
+      ).filter(n => !n.dismissed).length
+    ) {
+      this.exitDomFullScreen();
+      this._logWarningPermissionPromptFS("fullScreenCanceled");
+    }
+  },
+
+  enterDomFullscreen(aBrowser, aActor) {
+    if (!document.fullscreenElement) {
+      aActor.requestOrigin = null;
+      return;
+    }
+
+    // If we have a current pointerlock warning shown then hide it
+    // before transition.
+    PointerlockFsWarning.close("pointerlock-warning");
+
+    // If it is a remote browser, send a message to ask the content
+    // to enter fullscreen state. We don't need to do so if it is an
+    // in-process browser, since all related document should have
+    // entered fullscreen state at this point.
+    // Additionally, in Fission world, we may need to notify the
+    // frames in the middle (content frames that embbed the oop iframe where
+    // the element requesting fullscreen lives) to enter fullscreen
+    // first.
+    // This should be done before the active tab check below to ensure
+    // that the content document handles the pending request. Doing so
+    // before the check is fine since we also check the activeness of
+    // the requesting document in content-side handling code.
+    if (this._isRemoteBrowser(aBrowser)) {
+      // The cached message recipient in actor is used for fullscreen state
+      // cleanup, we should not use it while entering fullscreen.
+      let [targetActor, inProcessBC] = this._getNextMsgRecipientActor(
+        aActor,
+        false /* aUseCache */
+      );
+      if (!targetActor) {
+        // If there is no appropriate actor to send the message we have
+        // no way to complete the transition and should abort by exiting
+        // fullscreen.
+        this._abortEnterFullscreen();
+        return;
+      }
+      // Record that the actor is waiting for its child to enter
+      // fullscreen so that if it dies we can abort.
+      targetActor.waitingForChildEnterFullscreen = true;
+      targetActor.sendAsyncMessage("DOMFullscreen:Entered", {
+        remoteFrameBC: inProcessBC,
+      });
+
+      if (inProcessBC) {
+        // We aren't messaging the request origin yet, skip this time.
+        return;
+      }
+    }
+
+    // If we've received a fullscreen notification, we have to ensure that the
+    // element that's requesting fullscreen belongs to the browser that's currently
+    // active. If not, we exit fullscreen since the "full-screen document" isn't
+    // actually visible now.
+    if (
+      !aBrowser ||
+      gBrowser.selectedBrowser != aBrowser ||
+      // The top-level window has lost focus since the request to enter
+      // full-screen was made. Cancel full-screen.
+      Services.focus.activeWindow != window
+    ) {
+      this._abortEnterFullscreen();
+      return;
+    }
+
+    // Remove permission prompts when entering full-screen.
+    if (!FullScreen.permissionsFullScreenAllowed) {
+      let notifications = PopupNotifications.getNotification(
+        this._permissionNotificationIDs
+      ).filter(n => !n.dismissed);
+      PopupNotifications.remove(notifications, true);
+      if (notifications.length) {
+        this._logWarningPermissionPromptFS("promptCanceled");
+      }
+    }
+    document.documentElement.setAttribute("inDOMFullscreen", true);
+
+    if (gFindBarInitialized) {
+      gFindBar.close(true);
+    }
+
+    // Exit DOM full-screen mode when switching to a different tab.
+    gBrowser.tabContainer.addEventListener("TabSelect", this.exitDomFullScreen);
+
+    // Addon installation should be cancelled when entering DOM fullscreen for security and usability reasons.
+    // Installation prompts in fullscreen can trick the user into installing unwanted addons.
+    // In fullscreen the notification box does not have a clear visual association with its parent anymore.
+    if (gXPInstallObserver.removeAllNotifications(aBrowser)) {
+      // If notifications have been removed, log a warning to the website console
+      gXPInstallObserver.logWarningFullScreenInstallBlocked();
+    }
+
+    PopupNotifications.panel.addEventListener(
+      "popupshowing",
+      () => this._handlePermPromptShow(),
+      true
+    );
+  },
+
+  cleanup() {
+    if (!window.fullScreen) {
+      MousePosTracker.removeListener(this);
+      document.removeEventListener("keypress", this._keyToggleCallback);
+      document.removeEventListener("popupshown", this._setPopupOpen);
+      document.removeEventListener("popuphidden", this._setPopupOpen);
+      gURLBar.controller.removeQueryListener(this);
+    }
+  },
+
+  _toggleShortcutKeys() {
+    const kEnterKeyIds = [
+      "key_enterFullScreen",
+      "key_enterFullScreen_old",
+      "key_enterFullScreen_compat",
+    ];
+    const kExitKeyIds = [
+      "key_exitFullScreen",
+      "key_exitFullScreen_old",
+      "key_exitFullScreen_compat",
+    ];
+    for (let id of window.fullScreen ? kEnterKeyIds : kExitKeyIds) {
+      document.getElementById(id)?.setAttribute("disabled", "true");
+    }
+    for (let id of window.fullScreen ? kExitKeyIds : kEnterKeyIds) {
+      document.getElementById(id)?.removeAttribute("disabled");
+    }
+  },
+
+  /**
+   * Clean up full screen, starting from the request origin's first ancestor
+   * frame that is OOP.
+   *
+   * If there are OOP ancestor frames, we notify the first of those and then bail to
+   * be called again in that process when it has dealt with the change. This is
+   * repeated until all ancestor processes have been updated. Once that has happened
+   * we remove our handlers and attributes and notify the request origin to complete
+   * the cleanup.
+   */
+  cleanupDomFullscreen(aActor) {
+    let needToWaitForChildExit = false;
+    // Use the message recipient cached in the actor if possible, especially for
+    // the case that actor is destroyed, which we are unable to find it by
+    // walking up the browsing context tree.
+    let [target, inProcessBC] = this._getNextMsgRecipientActor(
+      aActor,
+      true /* aUseCache */
+    );
+    if (target) {
+      needToWaitForChildExit = true;
+      // Record that the actor is waiting for its child to exit fullscreen so
+      // that if it dies we can continue cleanup.
+      target.waitingForChildExitFullscreen = true;
+      target.sendAsyncMessage("DOMFullscreen:CleanUp", {
+        remoteFrameBC: inProcessBC,
+      });
+      if (inProcessBC) {
+        return needToWaitForChildExit;
+      }
+    }
+
+    PopupNotifications.panel.removeEventListener(
+      "popupshowing",
+      () => this._handlePermPromptShow(),
+      true
+    );
+
+    PointerlockFsWarning.close("fullscreen-warning");
+    gBrowser.tabContainer.removeEventListener(
+      "TabSelect",
+      this.exitDomFullScreen
+    );
+
+    document.documentElement.removeAttribute("inDOMFullscreen");
+
+    return needToWaitForChildExit;
+  },
+
+  _abortEnterFullscreen() {
+    // This function is called synchronously in fullscreen change, so
+    // we have to avoid calling exitFullscreen synchronously here.
+    //
+    // This could reject if we're not currently in fullscreen
+    // so just ignore rejection.
+    setTimeout(() => document.exitFullscreen().catch(() => {}), 0);
+    if (TelemetryStopwatch.running("FULLSCREEN_CHANGE_MS")) {
+      // Cancel the stopwatch for any fullscreen change to avoid
+      // errors if it is started again.
+      TelemetryStopwatch.cancel("FULLSCREEN_CHANGE_MS");
+    }
+  },
+
+  /**
+   * Search for the first ancestor of aActor that lives in a different process.
+   * If found, that ancestor actor and the browsing context for its child which
+   * was in process are returned. Otherwise [request origin, null].
+   *
+   *
+   * @param {JSWindowActorParent} aActor
+   *        The actor that called this function.
+   * @param {bool} aUseCache
+   *        Use the recipient cached in the aActor if available.
+   *
+   * @return {[JSWindowActorParent, BrowsingContext]}
+   *         The parent actor which should be sent the next msg and the
+   *         in process browsing context which is its child. Will be
+   *         [null, null] if there is no OOP parent actor and request origin
+   *         is unset. [null, null] is also returned if the intended actor or
+   *         the calling actor has been destroyed or its associated
+   *         WindowContext is in BFCache.
+   */
+  _getNextMsgRecipientActor(aActor, aUseCache) {
+    // Walk up the cached nextMsgRecipient to find the next available actor if
+    // any.
+    if (aUseCache && aActor.nextMsgRecipient) {
+      let nextMsgRecipient = aActor.nextMsgRecipient;
+      while (nextMsgRecipient) {
+        let [actor] = nextMsgRecipient;
+        if (
+          !actor.hasBeenDestroyed() &&
+          actor.windowContext &&
+          !actor.windowContext.isInBFCache
+        ) {
+          return nextMsgRecipient;
+        }
+        nextMsgRecipient = actor.nextMsgRecipient;
+      }
+    }
+
+    if (aActor.hasBeenDestroyed()) {
+      return [null, null];
+    }
+
+    let childBC = aActor.browsingContext;
+    let parentBC = childBC.parent;
+
+    // Walk up the browsing context tree from aActor's browsing context
+    // to find the first ancestor browsing context that's in a different process.
+    while (parentBC) {
+      if (!childBC.currentWindowGlobal || !parentBC.currentWindowGlobal) {
+        break;
+      }
+      let childPid = childBC.currentWindowGlobal.osPid;
+      let parentPid = parentBC.currentWindowGlobal.osPid;
+
+      if (childPid == parentPid) {
+        childBC = parentBC;
+        parentBC = childBC.parent;
+      } else {
+        break;
+      }
+    }
+
+    let target = null;
+    let inProcessBC = null;
+
+    if (parentBC && parentBC.currentWindowGlobal) {
+      target = parentBC.currentWindowGlobal.getActor("DOMFullscreen");
+      inProcessBC = childBC;
+      aActor.nextMsgRecipient = [target, inProcessBC];
+    } else {
+      target = aActor.requestOrigin;
+    }
+
+    if (
+      !target ||
+      target.hasBeenDestroyed() ||
+      target.windowContext?.isInBFCache
+    ) {
+      return [null, null];
+    }
+    return [target, inProcessBC];
+  },
+
+  _isRemoteBrowser(aBrowser) {
+    return gMultiProcessBrowser && aBrowser.getAttribute("remote") == "true";
+  },
+
+  getMouseTargetRect() {
+    return this._mouseTargetRect;
+  },
+
+  // Event callbacks
+  _expandCallback() {
+    FullScreen.showNavToolbox();
+  },
+
+  onMouseEnter() {
+    this.hideNavToolbox();
+  },
+
+  _keyToggleCallback(aEvent) {
+    // if we can use the keyboard (eg Ctrl+L or Ctrl+E) to open the toolbars, we
+    // should provide a way to collapse them too.
+    if (aEvent.keyCode == aEvent.DOM_VK_ESCAPE) {
+      FullScreen.hideNavToolbox();
+    } else if (aEvent.keyCode == aEvent.DOM_VK_F6) {
+      // F6 is another shortcut to the address bar, but its not covered in OpenLocation()
+      FullScreen.showNavToolbox();
+    }
+  },
+
+  // Checks whether we are allowed to collapse the chrome
+  _isPopupOpen: false,
+  _isChromeCollapsed: false,
+
+  _setPopupOpen(aEvent) {
+    // Popups should only veto chrome collapsing if they were opened when the chrome was not collapsed.
+    // Otherwise, they would not affect chrome and the user would expect the chrome to go away.
+    // e.g. we wouldn't want the autoscroll icon firing this event, so when the user
+    // toggles chrome when moving mouse to the top, it doesn't go away again.
+    let target = aEvent.originalTarget;
+    if (target.localName == "tooltip") {
+      return;
+    }
+    if (
+      aEvent.type == "popupshown" &&
+      !FullScreen._isChromeCollapsed &&
+      target.getAttribute("nopreventnavboxhide") != "true"
+    ) {
+      FullScreen._isPopupOpen = true;
+    } else if (aEvent.type == "popuphidden") {
+      FullScreen._isPopupOpen = false;
+      // Try again to hide toolbar when we close the popup.
+      FullScreen.hideNavToolbox(true);
+    }
+  },
+
+  // UrlbarController listener method
+  onViewOpen() {
+    if (!this._isChromeCollapsed) {
+      this._isPopupOpen = true;
+    }
+  },
+
+  // UrlbarController listener method
+  onViewClose() {
+    this._isPopupOpen = false;
+    this.hideNavToolbox(true);
+  },
+
+  get navToolboxHidden() {
+    return this._isChromeCollapsed;
+  },
+
+  // Autohide helpers for the context menu item
+  updateAutohideMenuitem(aItem) {
+    aItem.setAttribute(
+      "checked",
+      Services.prefs.getBoolPref("browser.fullscreen.autohide")
+    );
+  },
+  setAutohide() {
+    Services.prefs.setBoolPref(
+      "browser.fullscreen.autohide",
+      !Services.prefs.getBoolPref("browser.fullscreen.autohide")
+    );
+    // Try again to hide toolbar when we change the pref.
+    FullScreen.hideNavToolbox(true);
+  },
+
+  showNavToolbox(trackMouse = true) {
+    if (BrowserHandler.kiosk) {
+      return;
+    }
+    this.fullScreenToggler.hidden = true;
+    gNavToolbox.removeAttribute("fullscreenShouldAnimate");
+    gNavToolbox.style.marginTop = "";
+
+    if (!this._isChromeCollapsed) {
+      return;
+    }
+
+    // Track whether mouse is near the toolbox
+    if (trackMouse) {
+      let rect = gBrowser.tabpanels.getBoundingClientRect();
+      this._mouseTargetRect = {
+        top: rect.top + 50,
+        bottom: rect.bottom,
+        left: rect.left,
+        right: rect.right,
+      };
+      MousePosTracker.addListener(this);
+    }
+
+    this._isChromeCollapsed = false;
+    Services.obs.notifyObservers(null, "fullscreen-nav-toolbox", "shown");
+  },
+
+  hideNavToolbox(aAnimate = false) {
+    if (this._isChromeCollapsed) {
+      return;
+    }
+    if (!Services.prefs.getBoolPref("browser.fullscreen.autohide")) {
+      return;
+    }
+    // a popup menu is open in chrome: don't collapse chrome
+    if (this._isPopupOpen) {
+      return;
+    }
+
+    // a textbox in chrome is focused (location bar anyone?): don't collapse chrome
+    // unless we are kiosk mode
+    let focused = document.commandDispatcher.focusedElement;
+    if (
+      focused &&
+      focused.ownerDocument == document &&
+      focused.localName == "input" &&
+      !BrowserHandler.kiosk
+    ) {
+      // But try collapse the chrome again when anything happens which can make
+      // it lose the focus. We cannot listen on "blur" event on focused here
+      // because that event can be triggered by "mousedown", and hiding chrome
+      // would cause the content to move. This combination may split a single
+      // click into two actionless halves.
+      let retryHideNavToolbox = () => {
+        // Wait for at least a frame to give it a chance to be passed down to
+        // the content.
+        requestAnimationFrame(() => {
+          setTimeout(() => {
+            // In the meantime, it's possible that we exited fullscreen somehow,
+            // so only hide the toolbox if we're still in fullscreen mode.
+            if (window.fullScreen) {
+              this.hideNavToolbox(aAnimate);
+            }
+          }, 0);
+        });
+        window.removeEventListener("keydown", retryHideNavToolbox);
+        window.removeEventListener("click", retryHideNavToolbox);
+      };
+      window.addEventListener("keydown", retryHideNavToolbox);
+      window.addEventListener("click", retryHideNavToolbox);
+      return;
+    }
+
+    if (!BrowserHandler.kiosk) {
+      this.fullScreenToggler.hidden = false;
+    }
+
+    if (
+      aAnimate &&
+      window.matchMedia("(prefers-reduced-motion: no-preference)").matches &&
+      !BrowserHandler.kiosk
+    ) {
+      gNavToolbox.setAttribute("fullscreenShouldAnimate", true);
+    }
+
+    gNavToolbox.style.marginTop =
+      -gNavToolbox.getBoundingClientRect().height + "px";
+    this._isChromeCollapsed = true;
+    Services.obs.notifyObservers(null, "fullscreen-nav-toolbox", "hidden");
+
+    MousePosTracker.removeListener(this);
+  },
+
+  _updateToolbars(aEnterFS) {
+    for (let el of document.querySelectorAll(
+      "toolbar[fullscreentoolbar=true]"
+    )) {
+      // Set the inFullscreen attribute to allow specific styling
+      // in fullscreen mode
+      if (aEnterFS) {
+        el.setAttribute("inFullscreen", true);
+      } else {
+        el.removeAttribute("inFullscreen");
+      }
+    }
+
+    ToolbarIconColor.inferFromText("fullscreen", aEnterFS);
+  },
+};
+
+XPCOMUtils.defineLazyGetter(FullScreen, "_permissionNotificationIDs", () => {
+  let { PermissionUI } = ChromeUtils.importESModule(
+    "resource:///modules/PermissionUI.sys.mjs"
+  );
+  return (
+    Object.values(PermissionUI)
+      .filter(value => {
+        let returnValue;
+        try {
+          returnValue = value.prototype.notificationID;
+        } catch (err) {
+          if (err.message === "Not implemented.") {
+            returnValue = false;
+          } else {
+            throw err;
+          }
+        }
+        return returnValue;
+      })
+      .map(value => value.prototype.notificationID)
+      // Additionally include webRTC permission prompt which does not use PermissionUI
+      .concat(["webRTC-shareDevices"])
+  );
+});