Suddenly Firefox has stopped playing YoouTube and other internet sound

There are two sound internet weeks (and mp4s) ceased to have sounds.
I updated Firefox, Flash and anything else in sight.
Cleared history and Cache
Still no sound
I can play flv, mp3, avi, etc. and get sound
but now no sound on mp4.

XP SP3 Firefox 20

Thank you all. E proven problem that someone installed a Real Player Add on in Firefox. Disabling that fixed everything.

Tags: Firefox

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