[CentOS] Firefox 78 under CentOS 6 -- no sound?

Sat Oct 17 20:38:13 UTC 2020
Robert Heller <heller at deepsoft.com>

I did a yum update on my CentOS 6 laptop and it upgraded Firefox to 78, and 
FF stopped seeing my mic and speakers.  Is there some magic I need to do?  As 
a short term (?) fix, I downgraded back to Firefox 68.  My system is otherwise 

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