Installed recently, just used for first time. Had to give a high rating.
Try this add-on - has some sweet features especially fine speed tuning.

Ability to detach makes for easy resizing and multi-tasking, but once detached, I have to find original tab to find Enhancer control bar again - would be helpful if it's available on the one that keeps playing, or a little button to get the toolbar to appear in that tab.

An excellent add on to gain more control of vid's in tabs etc ...We love it.

simplemente genial, sobre todo si metes manos en los ajustes.

Love this add-on.

Really customizable.
Quick adoption to changes by YT.

Excellent, keep going !

A lot of options to custom the platform

Edit: June/July 2023 cinema notice from developer:
Note about the "Expand" and "Cinema mode" issues
They have been caused by changes on YouTube. I have fixed them in version 2.0.119, which is already available for Chrome, but still pending for review for Firefox and Edge, so no need to contact me about that or post negative review, it won't make things go faster. Thanks.

Holy crap, the settings are awesome. Everything I ever wanted (almost), auto fullscreen, Darker themes without using YT gaming, Always expand description, Sort comments (Wouldn't mind some more options here) and other quality of life features.
[Feature request] 4 stars because I really wish it would make media buttons work on keyboard, headsets, etc...

just about everything. Great app.

The auto-pause isn't available or is missing —I like my YouTube vids stopped when viewing them so I have time to view the description or make a decision —also make the buffering stop if possible.

Do also for Android platform, even only setting to defult videoplay quality would be fine...

I absolutely love being able to control the volume with my mouse wheel!!

This is f*cking lit

I enjoy YouTube much more now. This is a great add-on for my browser.

Nice

Ganz hervorragendes Programm,um Youtube-Videos zu geniessen.Hat viele Raffinessen.

The customization and the options.

excelente

Excelente herramienta complementaria para YouTube.!..