Great extension! I do see that sometimes errors occur whilst loading videos/video playback, but it's nothing that bothers me much. I really like how well it, well, works! Made YouTube 1000000x faster, no more AI crap, and it seems to place itself instead of the default YouTube stylesheets/appearance, so you don't even see a flicker of modern YouTube while using this extension. To be honest, I thought I reviewed this already!

TL;DR: 12/10, best extension I've ever seen (besides Tampermonkey and uBlock Origin, of course!), keep up the great work! :D