What tools do you use to troubleshoot javascript errors?#

While every browser has its strengths and weaknesses, this thread is about getting it done.

What tools do you use to troubleshoot javascript errors?

Chrome in built developer tools does the trick for me

I first check the built-in error console, then if that's not specific enough, Firebug.

Safari also has a developer add-on, but I don't use Safari extensively.

Chrome and Safari being both webkit based browsers share very similar (identical ?) developer tools - is anyone aware of differences in the developer tools? I tend to use Safari but that is merely a matter of habit. I have used Firefox and Opera as well as Safari and Chrome - so throw a dart, or some dice and pick one!

Chrome Dev Tools on Browser and jsLint plugin on Notepad++