I have the pre-unibody MBP, and when I'm scrolling up and down on a website, it keeps on zooming in and out. I use firefox and have 10.6.3 installed. I've asked my friends to try to make sure it wasn't just me, and when they scroll up and down it does the same thing. Does anyone else have this problem? I've searched and can't seem to find anyone else with this issue. Even when I disable the pinch to zoom option in system preferences, it still does it!