I use Firefox too, but got it few times.

I just got one of thess :(

Edit:  Apparently it's happening on other forums as well.

If this happens more often to me, and continues, I'd most likely give up coming here for awhile.

I never got it.

Yeah, when I first got it I thought that this site was charging to use the forums now. I was like what!? Then I saw what it wanted me to click and I was like oh it's a pop up -_-

So I just refreshed the page. It's annoying as you can not just close it, instead you are forced to refresh.

Gah, I've just got it again. That's it, I'm leaving for a few days. Hopefully it, and anything similar, will be gone by then.

yea it's pretty annoying oh well.

Yeah I was just about to start a thread about it , pretty annoying.

I got it again and its starting to piss me off.

I just started recently getting them. About 1 a day, I just reload the page and it goes away but it is quite annoying if it occurs in a large thread with lots of content that I'll need to reload all over again.