Any YouTube client that doesn’t track me that works on Linux or in Firefox?
I’d recommend FreeTube.
It has its own backend, but it can also use Invidious. As such, you can also run NewLeaf (an Invidious-compatible YouTube scraper based on the NewPipe scraper) in the background and connect to it via FreeTube, and that should work.
Freetube supports maximum 1080p, you should specify it.
Plasmatube https://invent.kde.org/multimedia/plasmatube
I used freetube a few years ago, but i dont know if the project is still active. Was a bit buggy, but acceptable for me
Been using it for half a year now, it’s amazing and running flawlessly as a flatpak on Fedora for me.
I can confirm it’s greatly improved in terms of reliability in the last couple of years.
At this point, it works more reliably than playing Youtube videos in a web browser.
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There are solutions that work. Like you, I would enjoy a simple app that allows for subscriptions and playlists without tracking or using an account. I mostly use RSS feeds (newsboat) and watch the videos through mpv.
And yt-fzf is great too. It uses invidious instances instead of YouTube links.
freetube is amazing
SMTube still seems to exist
I run LibreTube through Waydroid, but you have to enable HLS and do a bit of instancehopping to get it to work.