Hey there. To get straight to the point, whenever I am watching a YouTube video on Firefox in full screen, every so often the screen goes black then slowly fades back in. I have no idea how to fix this issues and it is not my computer that is causing it (doesn't happen on other browsers, my computer was tested for a variety of problems and nothing was wrong, etc). I have also looked through Firefox Reddit help pages and the support articles on the Firefox support website but have found nothing to help. Any suggestions or help would be much appreciated! Thank you :)