How to swee youtube videos,

[Aaron Konstam <akonstam sbcglobal net>]

In firefox I can see and hear videos that are .mpg or.wmv but on youtube
I can see the video but not hear the sound.

How can this be fixed? This is f9 I am using.
--
=======================================================================
You will give someone a piece of your mind, which you can ill afford.
=======================================================================
Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam sbcglobal net