In Firefox pre-installed with the factory OS (mrfixit2001's Debian build), audio does not work in most videos. See thread by 8jef.
Test cases:
- Audio works: https://www.youtube.com/watch?v=ZqMFS8MBzXc
- Audio does not work: https://www.youtube.com/watch?v=YSJ1vUubkTc
From forkbomb9, quoted by Jeb5Blovrueb:
- Go to
about:config
- Create the preference variable
media.cubeb.backend
and set it topulse
- Restart Firefox