a popup in Iceweasel saying "Attention! Your computer is compromised!" then some spiel about IE9 and no antivirus...
oh, wait, now where have I seen this before? (link for information only! Do the clicky on "free scan" links at your own risk!)
I don't know how. But. The idiots that come up with this crap have to be forced to sit behind a 12 yr old, bound and gagged, to understand what they intend. If they die of a stroke from the effort, at least it's one less idiot.
"We don't care. We don't have to. We're the Phone Company."