Free file headers software for windows

Modify Headers is a Firefox extension that can be used to easily add, modify and filter http request headers. You can modify the user agent string, add headers to spoof a mobile request (e.g. x-up-calling-line-id) and much more. Take a look at the help tab of the Modify Headers window.
Some people think that user-agent is a custom way of specifying the user agent string. This is not true, for a guide on this and other HTTP request headers, look at this W3C page.
System requirements:
- Firefox 1.0 ? 3.0*

Enhancements:
- Adds support for Firefox 3.0b1.
- Fixes a minor bug with header importing.

The Header Skip add on allows you to skip the beginning header of the realgm.com message forums.
Since the template expanded to a header thats about 600 pixels long, it makes the forum difficult to read. Header Skip will skip a customizable number of pixels whenever you load a forum page. The skip ahead is only made if the page initially loads with the scrollbar at the top of the screen (meaning if you do a refresh or a link takes you to a specific spot in the page it still goes to the correct spot).
System requirements:
- Firefox 1.5 or higher