Firebug is a Mozilla Firefox add-on includes powerful Java-script debugger. It has got gorgeous features to debug AJAX codes [DOM, CSS & Java-script codes]. Apart from debugging java-script codes it helps to learn AJAX programming through reverse engineering i.e. Analyze AJAX sites by looking at their Java-script codes even embedded Java-script codes and dynamically injected scripts through server side programs. Firebug’s script file chooser sorts and organizes files into very clean list that will help us find any file in a snap.
I felt, it is a must have tool in every web2.0 programmer’s box.