Unstoppable Talking Popups

Ok, I have adblock plus and I'm still getting apparently random popups. Some of them are bogus surveys - occasionally, as now, hours after I've been to site they claim to be about (they're all identical and they all boil down to "would you buy something cheap?"). But the really obnoxious ones come with sound.

I kind of wish I could uninstall Firefox 3.5.3 and go back to the previous version, you know?

But I can tell you this: I am never buying anything from anybody who hijacks my computer's speakers and tries to force me to listen to their ad even after I've closed their popup, even if it'll make me rich!, whether it's that Aussie guy with the investment system or the woman who wants to pay me to put links on Google.