I was completely suprised after I downloaded it....and it worked on one of the wed sites I frequently visit. Not only that, but I went to another site that is similar and when I clicked on a link it notified me, but before i could answer the block/don't block question it disappeard. I clicked in the link that brought the pop-up again and neither the question or the pop-up appeared. It was like it learned what I wanted it to do. Great job on a blocker that really works I suggest it for everyone.
It actually works! But there is slightly delay on some websites pop-up when this add-on blocks. I think it will delay due to the fact that most pop-ups had this kind of setting to open a blank page then later load the website. If I am not mistaken though, Haha peace!