I have a Mac, I need firefox for my Univ of Cincinnati school blackboard account. On Sunday I downloaded what I thought was a baseball tournament schedule and it sent me to a porn site. Every 5 minutes or so a new and sometimes different porn site opens in a new window, not a pop up. I have to have this for school and it is so embarrassing to be sitting in class and "gay porn' pops up or spank your momma. Please help