Upgrade to Firefox v90.0 Caused FF Sound to Stop Functioning

Sound works everywhere else (Falkon, for example), just not with Firefox. This happened immediately after upgrade to 90.0. I checked the settings in FF, made sure that sound was permitted under autoplay. Launched into safe mode. Even tried pkg install -f firefox. Videos (youtube) plays just fine, but without audio.

I'm not really sure what to do other than try to downgrade to the previous version. I'm on 13.0-RELEASE-p3. Ideas to check?
 
omg that totally worked! I'm always blown away that people know this stuff off the top of their head like you did.

Can't thank you enough, I would've never figured that out on my own, lol.

Anyone else that sees this, that setting doesn't exist in about:config, you have to add it.
 
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