Even worst: just tried to activate again unplugged HDMI which was then second of the list in pavucontrol, Firefox uses HDMI audio and not the internal audio device ! So only switching off HDMI gives sound back in Firefox.
Even worst: just tried to activate again unplugged HDMI which was then second of the list in pavucontrol, Firefox uses HDMI audio and not the internal audio device ! So only switching off HDMI gives sound back in Firefox.