I just recently purchased a Macbook pro and have downloaded firefox as my web browser. I installed the add-on adblock pro, and it is without a doubt 100% ineffective; I view web pages and when I place the mouse on top of the icon it tells me it is active, however below it notifies me that it has blocked 0 out of 150 or however blockable items on the given page. I mean absolutely nothing is prevented, I found a similar add on for safari, and the same results, nothing blocked. I must be doing something completely wrong, or something so blatantly obvious, but I really am clueless. Does anyone have any suggestions?