I've used all 3 browsers (chrome/safari/ff) daily doing web dev for years now and I'm convinced Safari just feels faster as a cohesive Mac app, with the animations and what not, but isn't in general when using the internet day-to-day. FF is little different than Chrome/Safari.

Also as a dev Safari is becoming the new IE. I've had a whole suite of Safari-only bugs in the past 2yrs and lots of browser crash reports from users.