Besides, how is the browser going to know? There are many ways that a page could be making noise: <audio>, <video>, Flash, Java, other random plugins
Also, how often do you have multiple tabs playing sound? I guess if you middle-click a lot of Myspace links all at once...
If you're running Chrome, why not disable all plugins by default and then set it up so that you can click to enable as needed? That's what I do!
Care to elaborate? How do I do that?
Note: I'm running Chrome 12, so things might be different for older versions. Also, I think I had to enable the click to play in about:flags. Before that, I'd have to right-click and choose enable from a menu.
He needs feedback to decide if it'll be implemented in The next version of Firefox.
I like what FF4 is doing with tab candy (panorama now?) and tab search. I'd really like a way to be able to see two tabs at once, though, similar to Windows 7's half-maximize.