According to the Sitepoint FAQs, most serious programmers debug their scripts by hand, but when my javascripts don't work , I like to be told why, the more explicitly the better.

I used to have NN4 and its debugging was fantastic (certainly more helpful than IE and Opera, although theirs aren't too bad). I was just wondering what other people think is the best browser/resource for debugging javascript. If it's Netscape, does this mean I have to download the whole browser, and does the debugging vary with version number? Which would be the best to get? (Note: I'm only interested in its debugging capabilities, not its quality as a web browser).

Please share your opinions .
Thanks.