It started last night, and it's been continuing again today, while browsing the forums. It's some stupid banner about some kid's picture and picking which singer it is, from ticketmaster I think it is. It seems to load when I move away from the page that generates it, so I haven't been able to check if it's the same banner causing it. It's also managing to somehow get past Firefox's pop-up blocker, some of the time.
The banner that's causing this needs to be found, removed, and a complaint filed with whoever has been putting it on the rotation.
"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
I recall when that banner came up, Firefox blocked the pop-up for me. If it didn't do so the first time it would explain why I had a single pop-up the other day, or there might be another banner floating around as well.