This is an old post that shows off a AJAX debugging tool written using Greasemonkey. It’s still an interesting idea, but what is perhaps most useful is the long trail of comments that make reference to all sorts of other useful tools such as LiveHTTPHeaders.
LiveHTTPHeaders is a great tool, but it doesn’t show the body of the request and response. That’s one reason why I created this script.
Also, this script now also runs under IE, so you can use the same tool for your AJAX development across these two browsers:
http://blog.monstuff.com/archives/000291.html