Finally, I’ve managed to enable middleclick on my macbook with triple tap. It works using a private osx api for using the macbook multitouch trackpad code and some middleclick code. Middleclick is really useful for all the Firefox junkie who loves to open in a new tab as it doesn’t require to use the keyboard (cmd+click is the default middleclick). MiddleClick should not interfere with the swipe gesture and you should not click the trackpad as it will send a click and middleclick at the same time!
Get MiddleClick (for Mavericks)!
MiddleClick (for Mountain Lion) (Go to System Preferences -> Trackpad and uncheck “Look up”)
or for MiddleClick (for Snow Leopard)..
Enjoy & donate if it brings you joy =)
You can get the source at http://github.com/cl3m/MiddleClick
Updated version with the change from carlosh & galonsky!