I know they’ve been getting more controlling over time, but blocking an entire browser, really? I’ve been watching YouTube over Firefox for 5+ years now just fine, and now they shut me out arbitrarily? Nah, fuck that.
Edit: It’s something wrong with the new LibreWolf update and my profile. Causes issues in both normal and private browsing, but not a different profile and is solved by switching user agent.
as an alternative, I recommend Yewtube (not to be confused with the Invidious instance with the same name):
https://github.com/mps-youtube/yewtube
It’s a TUI application that streams the music to mplayer, VLC or MPV depending on your preference. It can also handle playlists/albums.