Good!!!!

solo les falta la opción de traducir automaticamente al idioma seleccionado y pre cargar el video para que no se trabe a media reproducción

Fantastic!

Good! I like it. Very useful

anything you can do with YouTube, you can probably do better with YouTube plus this extension. I can change the speed of a video with a single click, see the video even while I'm scrolling through the comments, make the video take up the entire browser's content area (I prefer this to YouTube's normal fullscreen option, for reasons that are hard to explain), and much MUCH more, and so far I haven't run into any major bugs!

It would be better with more clear themes, not necessarily white but in lighter colors...
Cela serait mieux avec d'avantages de thèmes clairs, pas forcément blancs mais dans des couleurs plus claires...

I RELY on Closed Captions and when they don't appear within an hour or so of a vid going up I find I don't watch the the vids. New iterations of this "enhancement" seem to have hidden CC controls and are possibly slowing down the CC process to nothing...
PLEASE FIX THIS! For the deaf and near deaf, YouTube is useless without the CC.

Works okay, but it is a bad practise to not release the source code.