i had this problem for 2 months maybe now i use to ignore it but i said to myself why not find a solution so my problem is with firefox when ever i play a youtube video it cuts part of the video image and the full screen and theater mode icons as shown in the pictures but if i go full screen then exit the full screen it goes back to normal
here you can see what i am talking about some of the icons are not showing and it cuts part of the video image too
here i double click the video to go full screen to make the icons appear again and fix the video image
when i come out of full screen everything goes back to normal
and i uninstalled firefox and installed it again and the problem is still there so if you can help me i hope you do and thank you .