If you hang on the internet most of the day you will be happy to see this tool:
EasyGoBack -
http://www.unhsolutions.net/EGB/index.shtml - Its a great tool (for free!) which gives your mouse more power than you can imagine. Hold the right mousebutton and move to the left should fire your browsers back-action. The same to the right should fire forward-action. and so on, and so on. It is fully customizeable and works on IE. (because the other browsers has some of these functions already built-in. I think firebird has it)