The firebug firefox extension allows you to edit in real time your CSS code. Instead of having to make a change, reload, make a change, reload you can just edit it live to see the results.
Using the MyBic firefox extension you can easily debug serverside php scripts right in firebug. Want to see an expandable tree of your session data? Send it right to firebug!
![10 year old shows K-Fed how it\](http://img.youtube.com/vi/HU0nB2u8HAA/2.jpg "10 year old shows K-Fed how it\")
