An add-on that integrates into the lower part of your IE or Firefox window and can be opened / closed from the IE or Firefox toolbar, that allows you to capture HTTP / HTTPS traffic in real-time.

It can trace and display wide range of information, including Header, Content, Cookies, Query Strings, Post data, Request and Response Stream, redirection URLs and more. It has a request builder that enables you to handcraft a HTTP / HTTPS Request.

It also provides cache information and session clearing, as well as HTTP status code information and several filtering options. A useful developer tool for performance analysis, debugging and diagnostics.