Bad move by google, really. Start on a button click is one thing but auto-starting something that makes a bunch of noise on a page that has always been totally silent is really dumb.
Google doesn't autostart anything, it's a FireFox extension (Cool Previews) that loads the page in the background that causes the trouble. I suggest reading up on the real story before you start labeling things as "bad moves" and "really dumb".
