YouTube is severely throttling performance on Firefox because I used uBlock Origin.
I switched to Firefox last year because Chrome began to overlay static Ads on YouTube videos even if you use uBlock or any other ad blocker.
This week I noticed that YouTube is really slow on Firefox (interestingly right after net neutralilty rules were restored). I got curioused and went back to Chrome+uBlock and it was functioning fine (though static ad overlay is still there).
To confirmed my theory I changed my user agent on Firefox to the one I copied from Chrome and viola there's no performance issue at all.
Curious if anyone is facing this issue too.