Audio no longer playing on any videos from such as Facebook or YouTube.

Youtube currently uses the HTML5 player.

https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues

I gave up and downloaded Google Chrome. Everything works with Chrome. Obviously a problem with Firefox.

mlrk said

I gave up and downloaded Google Chrome. Everything works with Chrome. Obviously a problem with Firefox.

Aww,   was that   before   or   after   you tried that link   FredMcD   gave you   ?
'Sure you don't want to change your mind   ?

mlrk said

Obviously a problem with Firefox.

Just to let you know, Firefox doesn't play clips. The plugins do the playing.