To the web developers: ever get an obscure error in one browser, so run the code in a different browser to see if it’s more helpful? Try it next time you get a head-scratcher. Just now Firefox was giving me “NetworkError 596″. To which I said, “Oh, of course!” So I fired up Chrome, and it gave a much more helpful console message, helping me realize that I was accidentally trying to make a cross-domain JSON request instead of JSONp. Oops.
Anyway, I’ve found this technique handy for a bunch of things. Sometimes Firebug’s message is better. Even IE sometimes gives the most verbose errors. Just depends on what obscure problem you’ve run into!