HttpFox monitors and analyzes all incoming and outgoing HTTP traffic between the
browser and the web servers.

It aims to bring the functionality known from tools like HttpWatch or
IEInspector to the Firefox browser.

Information available per request includes:
- Request and response headers
- Sent and received cookies
- Querystring parameters
- POST parameters
- Response body

WWW: https://addons.mozilla.org/en-US/firefox/addon/6647