Ajax/Web debugging with Firebug

I've been using Firefox for a long time, and have always had Web developer plugin by my side for those miserable days. This tool which can save your ass at a time when you really need to understand what the heck your Ajax code is up to.

A couple of days ago I came across another such tool called  Firebug. All I have to say is that I was completely blown away by its intutive debugging style Cleaning up my messy Ajax generated code could have been a lot worse if this guy wasn't around.
Here is a quick feature list

* JavaScript debugger for stepping through code one line at a time
* Status bar icon shows you when there is an error in a web page
* A console that shows errors from JavaScript and CSS
* Log messages from JavaScript in your web page to the console (bye bye "alert debugging")
* An JavaScript command line (no more "javascript:" in the URL bar)
* Spy on XMLHttpRequest traffic
* Inspect HTML source, computed style, events, layout and the DOM

Console

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