[mintplant]

Firefox for Android does background playback too, and even provides media controls (exposing play/pause etc through the standard system API). Some sites may need the Video Background Play Fix [0] add-on.

For popping out YouTube videos I use NewPipe, a FOSS Android YouTube client [1].

[0] https://addons.mozilla.org/en-US/firefox/addon/video-backgro...

[1] https://f-droid.org/en/packages/org.schabi.newpipe/

[na85]

Interesting. I've only ever tried YouTube but on my Oneplus, as soon as Firefox loses focus, playback stops.

[mintplant]

YouTube should work with the add-on I linked installed.