nice tool for Ajax depelover

I sighted nice debugger for Ajax and others depeloping on web interface.
this debugger's name is Firebug extention for Firefox.
If it works as good as it should, there will be no need for Venkman anymore..
Venkman has been a best debugging tool for Mozilla,
but it is getting pretty out dated.
you can't have scrypt-debug using release v 0.3.2,
but If you wannt to try it, Joe Hewitt wanted tester.
http://joehewitt.com/