hi, I have a problem with my firefox, the sound is suddenly disappear. so I can't listen the sound from my firefox. example : 1. I open youtube, the sound is max, but theres no sound in my speaker. I open it on my internet explorer the sound is on . 2. while i'm playing on my facebook, there must be a sound or music, I have max the sound and music, but no sound in my firefox. please tell me what happen with my firefox and how I can solve this problem soon.. thankyou :)