Please add screenshots of the extension settings.

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!!!!!!!!!!!!!!!!!!!!!! INSTALL VERSION 109 !!!!!!!!!!!!!!!!!!!!!!

Scroll down and click on See all versions.
Then install Version 109 from there.
And then disable autoupdate for this extension from extension options.

Version 109 is working. Version 118 isn't. It's adding Manifest V3, which is for Chrome. Firefox doesn't need it.

Broke so many videos to the point I wanted to remove it. However, I realized I couldn't remove it! So I disabled it to keep watching youtube, but another problem came up! It turned ITSELF back ON! Probably spyware and will 100% break youtube.

Pointless. Does not work!

Isn't functioning

Currently breaks YouTube videos

Automatically setting the video quality to the user's liking does not work anymore on Firefox For Android 130+.

changing default speed doesn't work

Ghost module that absolutely does not work.
There is no need to waste time writing these modules if the result obtained is zero.
Someone will have to explain to me where the recommendation of this module comes from, I have trouble understanding.
I remove it and we will not talk about it anymore.
Linux MAGEIA 9.0
FF 115.13.0esr 64 bits

It's great extension! At least my YouTube always run on 1080p.

Doesn't do anything on firefox mobile on android.

Does not work at all, Why still recommended?

Set to 1080p, but playing at 720
(URL: https://www.youtube.com/watch?v=tnu571p2CCw)

See here for the only addon working:
https://addons.mozilla.org/de/firefox/addon/hd-quality-toggle-for-youtube/