Firefox: Video but no audio

[Carmel NY]

FreeBSD-7.2

Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.9.0.11) Gecko/2009062122 Firefox/3.0.11

I am having a problem getting Firefox to play audio. For instance, on
Youtube, it will display the video portion fine; however, there is no
audio present. Also, when I visit sites that have background music, it
does not work with Firefox either. In fact, that is how it responds to
every site I have tried it on.

Is there a plug-in that I have not installed?

-- 
Carmel
carmel at hotmail.com

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