firefox plugin that records traffic

HttpFox

Excellent for debugging Ajax stuff.

You could also try the HttpWatch plugin for Firefox. It shows time charts like Firebug and groups requests by page as you click on different links:

_{(source: httpwatch.com)}

There's a free and commercial edition. The free edition only displays detailed information for a limited number of well known sites (e.g. microsoft.com, google.com, etc).

You can find out more about HttpWatch on our web site:

http://www.httpwatch.com/

DISCLAIMER: This answer was posted by Simtec Limited the company behind HttpWatch