Firefox became all blurry, white, and flickering

Okay, I have done some tedious trial and error by attempting to recreate the problem. I suceeded. This bug has nothing to do with Firefox profiles, so if you run into that same problem, don't delete yours. Actually, it has to do with a conflict between Nvidia and the new version of Firefox.

The Nvidia box responsible for the bug

If you encounter that problem:

• Run nvidia-settings
• Go to Antialiasing settings
• Uncheck "Enable FXAA" (like on the image)

I can't remember why I activated that option in the first place (maybe for OBS, DaVinci, or Kdenlive stuff?), but anyway for now everything is fine.

If you want to check out the bug (to send a ticket?), just check the box (you'll need an Nvidia graphic card, of course).