My new c2d iMac run perfectly but have recently noticed a strange thing when using firefox. after a while of use it will start to do strange things like: 1. move the mouse and the fonts grow or get smaller 2. clicks on things wont actually choose them 3. clicking on anything after that even the dock doesnt do anything. I kill the browser and try to restart it and it doesnt do it. neither does anything else except log out or restart. after restart all is as usual. I tried not using firefox and just used safari for a day and the problem didnt come back. go back to firefox and it happens again! weirdness in the latest firefox maybe? Thanks for your thoughts.