Free Javascript debugger?

Hi,

Are there any good free IDE's/Debuggers for Javascript does anyone know?

I'll like to be able to step through my code and see the contents of variables etc.

Never seen one, Google throws up a few but I'm sure I'm not alone in getting fed up installing different versions only to find they don't do what it says on the tin.

I'm not after anything super feature rich, jsu the basic would be fantastic.

Thanks!!!!

 

Firebug is really powerful stuff.

 

Thanks for the recommendation, best one I've found yet.

Being used to Visual Studio for C++, these seem much less use.

Reputation added

 

if you can't use firebug and need to fix scripts for IE... then you are in trouble.

microsoft script debugger is also ok for IE based debugging. then there firebug lite as well for IE as well as the IE Developer Toolbar (which is more about resources and dom walking than actual debugging tbh).

gl.

 

The debugger in IE8 B2 is not bad, considering.

But in that case you need to use beta software or wait a couple months.

 

oh and of course, XBug:
http://www.xbug.co.uk/