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Firefox 131.0.3 has no sound and it does now show up on volume mixer
(lemmy.dbzer0.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Found a solution, thanks to Bigsleep62:
"I solved this problem by going to settings -> system -> sound, then under "Advanced" click "Volume Mixer," then at the bottom press "Reset sound devices..." Windows 10"
It worked for me on Windows 11 too