Something I have learned just recently that I'll pass along hoping it will help someone.
I have a pop up blocker, it came with Firefox I think, anyway it does a great job I never have pop ups. But there is a new type that floats across your screen, very aggravating because it will block what you are trying to read. My computer guru advised me to never click on these things not matter what they are selling or saying, even companies you trust. They even have a black x up at the right hand top like most things to click on to turn it off. My guy, after fixing my computer, says if you click on anything, even the black x, it will start a program running. Until someone comes up with a fix for these things don't click them. I just keep moving my screen around until I read what I wanted to that they are trying to block. And no I don't go to porn sites.