I think this is something that Google requires on Play Store, but there's a Firefox extension you can install to make it work: https://addons.mozilla.org/en-US/android/addon/video-backgro...

Aren't every firefox user using newpipe or other yt frontends on mobile?

I mean if you care enough to not use the default mobile browser, surely you found out about newpipe and the myriad of other youtube frontends.

My main issue is NewPipe struggles with being attached to an account. Its a great app for me to open a video link in / use to download it.

While using firefox mobile + ublock its easier to be logged into a youtube account and dig through favorites, etc.