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...