Over the last few months, I've noticed I'm getting a strange type of pop up that covers the whole page with a somewhat opaque film, usually showing a photo of sorts. I operate with my page color set to a more eye relaxing shade of light tan rather than the glaring white of most pages. This means I cannot see where the dang OFF switch is to get rid of the pop up. My question is, what is this new type of PITA that someone has come up with? I am using Adblock Plus and Better Privacy add ons with Firefox 3.6.13. What add on, if any, can I use to keep this nonsense from coming up and covering the page I'm trying to read?