I've already use this extension on Chrome for years.
This add-on provide a lot of features, my best recommend is boost volume. Besides, it also have many great things for you to discover

SUGGESTION: Some videos have terrible audio quality because they play in only ONE HEADPHONE, giving users a headache. If a feature were to be added that changes the sound type from stereo to mono, this extension would be a miracle!

VERY nice

a must have add-on for firefox users

Great addon

feature request: setting that when turned on will skip back a set amount of time when you unpause

Génial, fonctionne du feu de dieu. Un des meilleurs modules FireFox.

I am at a point where I can't use youtube on other browsers because of these missing features. However since the last big update the auto expand feature does not always work, I'd say once every 3 to 4 videos I have to manually expand the video to fit the entire screen. Also, the buttons are transitioning very slowly (3-4 seconds since clicking until something happens), sometimes they stay folded and the three dots do not appear at all until refreshing the page.

Simply THE BEST addon! With the latest version there is no other addon on Internet that can match it (not even close).

Was a great add-on for a long while, made YouTube much more bearable. However, the most recent update (as of 3/15/21) has made YouTube awful to use. Videos will load up at 0.25 speed but the speed isn't changeable in either the video itself or the enhancer app settings. The videos will play in 0.25 but both settings will say the speed is actually at 1. In order to fix the reduced speed, I have to completely close out the browser. Additionally, my YouTube constantly logs me out for no reason now. I have to sign in again every single day. I don't know if these reasons are attributed to the app, however I am only having issues with YouTube, no other website or app on my browser. Also, these issues only appeared once I updated the enhancer app. I love everything else about the app, but these issues are making it so hard for me to just watch videos. Hopefully they can fix this in a newer update but I'm unfortunately tired of it.

ótimo! Tem salvo minha vida e feito eu economizar tempo