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

Firefox, but if you do need a chromium based browser try ungoogled chromium

Yes

This is exactly what I was about to comment

I host a nextcloud sever (snap) and a minecraft server on a laptop I no longer use

An ir blaster, great as a universal remote

There is a way to play bedrock on Linux, you can install in on the steam deck in desktop mode using flatpak and the Discover centre, you just need to own bedrock on android

This is exactly why we need Mozilla, this is kind of stuff what makes them the default in the open source community.