would recommend https://addons.mozilla.org/en-US/firefox/addon/youtube-addon/, idk if 100% of the features you mentioned are on there but worth a try
this post was submitted on 22 Nov 2023
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I hadn't noticed. Why has it gone, do you know?
officially the developer mentioned that the changes the youtube devs broke it completely in firefox and slightly broke it in chrome so he stopped it temporarily.
I hope @MaximeRF find the time/motivation to fix it. I just was reminded it'd gone when I went to use the boost volume feature.
I hope ad-blocking isn't the blocker, because uBlock Origin handles that (although I suppose uBO doesn't cover things like channel whitelisting).