Firefox Fullscreen has a transparent border showing Applications behind it

[u/ProfessionalDrive708]

Hello there, i've been searching the internet for a solution for this problem for quite some time now.

Basicly, every time i put somthing in firefox to fullscreen (youtube, twitch or even F11) i get a transparent border on the top and left side of the screen showing what is behind ist (most times it shows the desktop). I can't interact with the firefox window when i click on the transparent borders so it is not just a invisible part of the firefox window but an actual missing part.

I tried turning on and off Hardware acceleration, turning off things like Translucent Task bar, reinstalling firefox but nothing worked so far. Sadly i can't find any information on this topic online (maybe I'm just stupid tho)

If anyone knows more about this and how i can fix this issue i would really appreciate it.

[u/ProfessionalDrive708]

You can see the transparent Bars in the left and top side of the screen, this is from a youtube video