Display Issue

Have you encountered a display issue that some screens are horizontal blue lines in browser?

This seems like an Graphics issue with newer Mac (I’m on MacBook Pro 2019 16") on Apple’s end.

I haven’t experienced this problem on Safari.

Workaround

Disable Hardware Accelerations. ⌘ + , to open Settings.

Chrome
Advanced Settings > System > Turn off hardware accelerations

Firefox
Performance > Uncheck "Use recommended serformance settings" > Uncheck "Use hardware acceleration when available"

Then restart your browser.

Or you could try to reset NVRAM or PRAM.

Hope this helps!