[Updated] Is sound OK for you here?

[Sarcany]

S. Pupp wrote:
I swear -- the number of bizarre bugs in MacOS/iOS is growing.

I wouldn't be so quick to blame the OS.

I've seen behavior like this and worse -- making the mouse/cursor jumpy, causing the screen to go blank or flicker, making sound drop-out, causing the entire OS to stall for up to a full minute -- in the new Firefox. Not sure why, but the symptoms often persist for a few seconds after quitting the program. They nevertheless go away shortly after quitting Firefox so it's clearly the cause.

...My guess is that you've updated to Firefox Quantum recently.

Download and run the "extended support release" version of Firefox until they get around to fixing Quantum.