Crackling audio (partly) solved.

[TheSnark]

Multiple tabs open. FF trying to monitor audio on all tabs at the same time.

Way to check and solution: Close all but one tab and restart FF. Sometimes things can get so goofy rebooting the computer may be required.

FF needs it's own audio processing instead of using plug ins from other sources.

[TheSnark]

By the way, the crackling sound happens when streaming more than one video and switching tabs or windows between them.

[yuzhang]

It's interesting to see the challenges with audio monitoring in Firefox. Restarting the browser or even the computer can be a hassle, but it's crucial for smooth performance. It would be great if Firefox could enhance its audio processing capabilities. For those looking to improve their online experience, check out  openhuman  for innovative solutions!