Weird bug in Kde/firefox and full screen(F11)

i might report a bug later on on KDE,but wanted to see if other people have it too on manjaro and what might be the cause.
pressing F11 in Firefox brings a black screen instead of going full screen.
i found the solution here:(disable “full screen” effects under “Desktop effects”

I just pressed f11, it went full screen??

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maybe it’s related to Nvidia or the display’s scalling size.

Same here, pressed F11 and FF88.0b4 went full screen
Kernel: 5.12.0-1, KDE Plasma 5.21.3 but Intel HD Graphics 530

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Tried it with and without that setting, yet it functions normally when going to full screen in Firefox (and even in other web browsers.)

Latest 5.10 kernel, KDE Plasma (5.21.3), and Nvidia drivers (460.67)

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i just tried it again after reverting my display scaling from 118 to 112,and it works fine now.

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