Not sure what happened...but Firefox 86.0 on Ubuntu 20.10 is suddenly ignores ALL sound settings
- Playback via internal speakers, even when everything else goes through headset
- Ignoring system volume settings -- using function keys to increase/decrease sound has no effect.
All this stuff works in Chrome on the same system.
UPDATE: I've noticed that if I disconnect the bluetooth headset, then FF at least respects the system volume settings.
I stumbled across the answer....
Bingo!