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sound - Firefox doesn't play audio - Ask Ubuntu
https://askubuntu.com/questions/666041/firefox-doesnt-play-audio#:~:text=Other%20applications%20in%20Ubuntu%20play%20sounds%20as%20expected.,TV%20then%20Firefox%20audio%20correctly%20plays%20through%20TV.
sound - Firefox doesn't play audio - Ask Ubuntu
https://askubuntu.com/questions/666041/firefox-doesnt-play-audio
Because (as far as I know) firefox does not have any way to select an audio output device, if you change the output device for an application it will retain that information.... my guess is that at some point you, or someone else (or some application) has selected HDMI audio for firefox, and that has been stored.... you just need to change it back to the default device.
Ubuntu Linux: No sound at all in Firefox 65.0.1 | Firefox ...
https://support.mozilla.org/en-US/questions/1252773
Ubuntu Linux: No sound at all in Firefox 65.0.1. 2 replies 1 has this problem 7947 views; Last reply by OldReliable 2 years ago. OldReliable. 3/11/19, 6:00 AM. more options. Quote; All other apps (like Chrome, Spotify, and audio configuration sound test) sound fine. I've tried -safe-mode, re-installing, and removing duplicate Flash plugins. ...
No sound from Firefox or Discord, and they ... - Ask Ubuntu
https://askubuntu.com/questions/1191620/no-sound-from-firefox-or-discord-and-they-occasionnally-freezes-ubuntu-18-04
Finally, I recently found which it affects also Discord, it means that Firefox may not be the culprit but Pulse-Audio's daemon. With Discord, it makes hundreds of errors in the logs: AVC apparmor="DENIED" operation="open" profile="snap.gnome-system-monitor.gnome-system-monitor" name="/run/systemd/sessions/2" pid=5368 comm="gnome-system-mo" …
Sound problem in Firefox after upgrade to 18.04 - Ask …
https://askubuntu.com/questions/1039012/sound-problem-in-firefox-after-upgrade-to-18-04
The answer was this old fix: No sound from Chrome, sound works fine in Firefox etc (13.10) Install pavucontrol from the Terminal: sudo apt-get install pavucontrol. To open pavucontrol from the Terminal: pavucontrol. Select the "Playback" menu and make sure that you have it set to Show Applications.
No audio on Ubuntu/Linux : firefox
https://www.reddit.com/r/firefox/comments/f6tg8u/no_audio_on_ubuntulinux/
Go to settings , search for volume, audio or multimedia settings and then go to applications tab if there is one (I'm not using ubuntu though I used to) and select the output for the speakers you want! And this seems like an ubuntu issue, not firefox.
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