There is one thing that stops me from using Safari (or Chrome/Opera) on Mac OS: the lack of middle-click autoscrolling.
Firefox lets me do a triple-finger tap and then scroll a page smoothly at a consistent pace. This is wonderful for reading sites such as HN without getting RSI from doing the same motion again and again.
Just one thing though, when hitting tab it seems to be getting the root file and it doesn't work then.
E.g cd Photo-Video cd Sunrise<tab>