I don't know what happened.
I have the sound piped to a USB wireless sound card and all was well but, as of yesterday Mozilla is using the internal sound only.
The video (Totem) and audio (Rythmbox) both are using my sound setting in sound preferences but Mozilla is not.
P.S. I was trying a few things and installed KMix to look at that after I had a problem and running from a shell it reports
kmix(29636): Hiddeous Channel mixup map says 1 , volume says: 2
I don't know if Hiddeous is a name of something or a warning.
Perhaps it's nothing.