Linux: Small window flickering after restart
so I usually have two Firefox windows open, both in fullscreen. When I than shutdown and restart my computer, and open Firefox again, it will create two windows with the tabs I had opened before (although I didn't check "Restore previous session" in my settings), but one of those windows will be small and flickering while the other is working normally. A solution I found to stop it from flickering is to press "F11" two times to maximize it and than get it back to normal fullscreen mode.
Firefox: Version 92.0 (64-bit) Ubuntu: 20.04.2 LTS (Focal Fossa)
Thank you in advance.