There is no sound preference in firefox.
I use firefox for many years in osx.
It is the first time that I am having such a problem.
And I wonder if I am the only one!
I have some suspicion about html5 matters, but why this problem appeared right after 10.8.2 installation?
I also want to tell that the problem existed in firefox 15, and now in firefox 16.
I also discovered that the problem exists in google chrome browser and in opera!
So, the safari seems to be the only one without sound problem in youtube videos, in 10.8.2
This is unfair.
Apple cannot force me/us to use safari.
Is there any change in html5/flash video handlng in 10.8.2?
Am I the only one with youtube sound problem in all browser except safari, in 10.8.2?
There should be a solution.
Apple maybe altered something.
I need a fix.