Slo-mo is one of the coolest features of the iPhone camera. By filming at a high frame rate and then playing back the footage at a lower frame rate, the slo-mo creates emphasis on a few frames in the ...

There are two things going on here:<BR>1) Safari uses lower-level text drawing to improve speed. It's one of the fastest-scrolling apps on OS X.<BR>2) FireFox redraws the whole window when you scroll.