Ok, here is what happened (Before this, Firefox rarely got to 20% of my CPU) My mac ran normally, until I downloaded an .mkv file, four gigs (A bluray rip) I had Miro installed, and Miro barely could run this movie, while running my other media fine. I decided to trash the movie because it made Miro take up 90% or more of my CPU. Then Firefox started taking up about 70% of my CPU, and sometimes 110%. I notice that Firefox drops down to 15% and lower when I have Tor and Torbutton active. I have no clue why it suddenly does this. Firefox only starts hogging my CPU when it is communicating with the internet. Does anyone have a clue what might be going on?