For example, when I open a YouTube video on fullscreen, go to the desktop by pressing Win + D, and return to Firefox by pressing Win + D, the video is no longer on fullscreen, but my tabs and taskbar are invisible. It happens on every site with fullscreen, regardless of whether I watch video or play a web game. I already tried to go into troubleshooting mode, but it did nothing. I also tried to remove fullscreen animation, but nothing again. How to fix this bug?