Help with my Imac build in cam

[gokuu]

Im trying to get it to work on firefox but it doesnt work anymore, it did before but not now. I know my cam works because I can go in photo booth and use it also tried it on IM, and messenger and it worked...


Any ideas?

I have a 20" Imac, older version its the white one from like 05 or 06 i think

thanks guys