Well done Rated 5 out of 5 stars

Although modern web developer tools like Firebug include http tracing, I personally prefer Httpfox because of it's better arrangement of the information. Everything stays in the same location for each request/response and you can see full URLs without hovering over the entries, while in Firebug have to do a lot of scrolling and clicking to see what's going on.
Unfortunately there's few activity in including new features.

This review is for a previous version of the add-on (