Are you sure you mean Firefox and not Songbird? Or are you talking about websites that have sound or video/audio files playing in the background because Firefox doesn't make its own sounds.
Yes you are right but i have to do it in windows xp. That's the client requirement.
And thanks for informing me, i couldn't check it in windows xp. I had forwarded this links to my developers. Now they will search some other software like that.
You cannot do it in Windows XP. It doesn't not have that functionality.
This feature was introduced in Windows Vista when the audio sub-system was rewritten.
Logic without the fatal effects.
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