I’ve been sticking with music players that can output directly through alsa. I settled on strawberry cause it can do that and also has other features that i care about baked in ootb. Deadbeef can also output directly through alsa and i liked it for the most part, but what i didn’t like was that things like mpris support wasn’t baked in, so i would have to mess with plugins. I don’t know if there are any other players that can output directly through alsa, those are the only two that i could find so far.
I highly doubt it. Even if they did though, if they just replace it with a firefox fork it could work pretty much as a drop-in replacement.