I am getting a strange ad pop-up that just started today. It took me a couple tries to get a screen capture of it but I finally got it.
This is what keeps popping up, but only for a few seconds and if you happen to click on it, it goes to an advertised site. I am even using firefox and it still comes up. It was annoying because when i was about to submit a post this ad box appeared right over the submit button just before i clicked and so it took me to the ad site...
It's that black box, that is all it seems to show and it goes to a different site every time i click it.