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
Yesterday I had an issue where the audio for Firefox was set to "mute" on Linux, even after a restart of the browser. I'm not sure if it was my own fault and thought that I hit a key combination to mute it. When I checked in my operating system the audio for this application, it was on mute and I have no idea why. After unmuting its normal now. I update frequently, so maybe this was a problem with the update after all.
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