Like what BenA said, there really needs to be a *cumulative* CPU usage measure by tab in Firefox -- even if we could just get this in the Firefox task manager -- equivalent to Windows task manager's "CPU time".
I don't precisely remember the old way in which this was handled, but why can't the mute button just make use of some of the tab width that is already there, rather than widen the tab when it's playing? Doing it this way would both deal with the very...
