[CentOS] No sound after latest Firefox update (firefox-78.3.0-1.el6.centos.x86_64)

Wed Sep 30 02:16:05 UTC 2020
Robert Nichols <rnicholsNOSPAM at comcast.net>

With Firefox updated to firefox-78.3.0-1.el6.centos.x86_64, I cannot get sound from Firefox. I've tried restarting pulseaudio, also logging out and logging back in. No help. Other A/V apps work just fine. Downgrading to firefox-68.12.0-1.el6.centos.x86_64 makes sound work again. For now, I've excluded version firefox-78.3.0-1 from yum updates.

Anyone else seeing this? Any hints?

Bob Nichols     "NOSPAM" is really part of my email address.
                 Do NOT delete it.