Bug 1865914 - Part 3, r=Gijs,edgar

Differential Revision: https://phabricator.services.mozilla.com/D194886

browser/base/content/browser-fullScreenAndPointerLock.js

@@ -6,8 +6,6 @@
 // This file is loaded into the browser window scope.
 /* eslint-env mozilla/browser-window */
 
-const FS_PERM_PROMPT_TIME_SHOWN_OFFSET_MS = 2000;
-
 var PointerlockFsWarning = {
   _element: null,
   _origin: null,
@@ -475,11 +473,6 @@ var FullScreen = {
         this._permissionNotificationIDs
       ).filter(n => !n.dismissed).length
     ) {
-      if (PopupNotifications.panel.firstChild) {
-        PopupNotifications.panel.firstChild.notification.timeShown +=
-          FS_PERM_PROMPT_TIME_SHOWN_OFFSET_MS;
-      }
-
       this.exitDomFullScreen();
       this._logWarningPermissionPromptFS("fullScreenCanceled");
     }