Firefox Artifacting/UI Glitch: How to Fix

In this guide, we will show you a couple of handy workarounds that should help you fix the artifacting UI glitch in Firefox after updating to the latest version 139. The issue is mostly predominant on websites that have multiple media embeds, such as YouTube, Facebook, Instagram, and Reddit.

Bought a 144Hz monitor, Firefox causes crazy artifacts, everything else is fine, including Chrome. How do I fix this? by u/EpicRageGuy in firefox