Many may already know this, but I thought I would post anyways... if you want to make greater use of gestures while browsing, and use Firefox, see the article here...
http://forums.macrumors.com/showthread.php?t=737074
There are assignable gestures hidden in about:config, and browsing is so much better once you find some customized combinations that you like.
Here are the ones that I have altered and find helpful:
Swipe down: new tab
Swipe up: go home
Pinch in: close tab
Pinch out: toggle between full screen/not full screen
Rotate right: reload
Rotate left: undo close tab (for those times you accidentally pinch in)