http://www.usingmac.com/2007/11/21/mac-os-x-leopard-200-productivity-booster-hotkeys
If you do content management for web content using FireFox, you may find issues when pressing the Command/Left Arrow key combination during the editing of your content whereby losing all of your data because Firefox treats those keys as a Browser Back button. To avoid this, you can install the Firefox plugin keyconfig (search keyconfig [...]