Vimeo works fine, nebula works fine, max works fine.. youtube videos play fine, the ui is hitchy/pause-y/janky. It's WIDELY reported that this is a problem with youtube specifically on firefox and ONLY since they went on their adblocker blocking schemes. (even though I subscribe to youtube premium and disable my adblocker on their site). This happens if I have 100 tabs open or if I cold boot my system and start up a new firefox with a single tab.

Swallow your fucking pride and admit that you don't know what you are talking about.