They could easily "flash" when the sound begins if it's not the active tab. That would be useful, and that wouldn't dedicate any unnecessary space. Especially u

They could easily "flash" when the sound begins if it's not the active tab. That would be useful, and that wouldn't dedicate any unnecessary space. Especially useful if you have sound turned off. (Similar feature in Ubuntu: when sound is turned off and an application wants to play something the sound icon turns red)