I can do PiP on Firefox android by playing the video in fullscreen and returning home. There’s an add on for FF, Video Background Play Fix, that allows me to play in the background as well.
It’s the only thing stopping me from using GOG more. I’ve fiddled with Lutris but it’s still pretty finicky. Proton making things run out of the box most of the time make it very hard to switch off of Steam.
If you are in to singleplayer bot matches Ravenfield is pretty cool. The game’s workshop is vast, so you can go from a WWI shooter to 40K and everything in between.
Got me in the first word, not gonna lie.