Mutliclutch: Gestures for Everything!

"MultiClutch works by installing a simple input manager that will catch a gesture events, looks to see what shortcut you've defined for it in the frontmost app (if you haven't defined anything, it behaves in the standard manner), and performs that shortcut. You use a System Preference Pane to customize gestures with an interface similar to the shortcut-customization table in the Keyboard & Mouse pane. You can ‘bind' gestures in a given Cocoa app (due to the nature of input managers, Carbon apps are not supported) or globally. In addition to zooming in and out, and rotaing in either direction, and the four swipe directions, I've been experimenting with ‘combo' gestures. Right now, I've added the ‘zoom in, zoom out' gesture (i.e., in one fluid motion) and vice-versa, with more perhaps to come if I find them to be intuitive and useful enough."

At one point, I actually considered going back to Safari just so I could use the multi-touch gestures to navigate the browser, but those thoughts have now completely left my head.  Multiclutch is an awesome app that adds gestures with your new MacBook or MacBook Pro trackpad to any app including those that didn't even support the system-wide gestures the first time around.  If you own a newer Apple laptop, this is something you need to grab from the developer even if it's only to make Firefox work more like Safari (which is the only reason I grabbed it, but I have a feeling I'll be doing much more with it).