YSK: You can install an extension on Firefox (android) that allows you to play YouTube videos with your screen locked: (perfect for listening to obscure music)
It can be a bit buggy at times, but when it comes to just playing music with the screen locked, it's perfect.
Edit: I forgot to also mention that ad blocker extensions make sailing the seas on mobile much more manageable. Extentions, in general, have been a really nice addition.
The fact that they attempted them at all is a breach of trust (and I say that as someone who's been a Firefox user and advocate without interruption since all the way back when it was called "Phoenix").
Lol people have been "ditching" Firefox for various reasons for years. If you can barely get people to ditch Chrome, good luck with making some ff fork relevant.