Installed VLC, problem is gone. This has been confirmed on multiple
systems. Something about the way FireFox is handling media.
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https://bugs.launchpad.net/bugs/1917816
Title:
Firefox n
Downloaded the ubuntu-20.04.2.0-desktop-amd64.iso image and installed a
virtual machine, updated it with apt update && apt dist-upgrade.
Rebooted, tried firefox again and saw the same problem. Disabled most of
the security and privacy restrictions in the firefox settings, same
problem.
# apt info