How to mute single window/tab?

[iJammer9]

I use safari, but also use FireFox or Chrome occasionally, I'm just wondering if anyone knows how to mute audio on a single window or tab on any of these browsers.

 

[BlueRevolution]

You can mute audio coming from a given application using Audio Hijack Pro, but there's nothing for a single window as far as I know.

 

[iJammer9]

You can mute audio coming from a given application using Audio Hijack Pro, but there's nothing for a single window as far as I know.

Do you know anything that's free?