When the screens are arranged vertically in a multi-monitor environment, a part of Firefox maximized on the bottom screen is displayed protruding from the top screen.
I'm in a multi-monitor environment with screens arranged vertically(Fig1). When Firefox is maximized on the bottom screen, a part of Firefox is displayed protruding on the top screen.(Fig2) The same reduction did not occur in Chrome.
You can try to disable hardware acceleration in Firefox.
- Options/Preferences -> General: Performance
remove checkmark: [ ] "Use recommended performance settings"
remove checkmark: [ ] "Use hardware acceleration when available"
Close and restart Firefox after modifying the setting to make changes effective.
You can check if there is an update for your graphics display driver and check for hardware acceleration related issues.