Tamperdata firefox addon to modify http headers

TamperData is an open source firefox add-on which can be used to manipulate the html requests and responses.It can halt the traffic http requests and modify any of the data that is being submitted to the website.
It's wise use can enable us to tamper or modify data to view and modify HTTP/HTTPS headers and post parameters...TamperData is an easy, excellent way to see what web application is doing and we can start testing it with different and various types of data.
It's common uses can be inspection of
1)cookie handling by the browser

2)redirections

3)http authentication etc

Extension is the predefined set of context menu entries that makes tampering with parameters so much easier. These context menu entries include static elements such as SQL, XSS and others.That means there is no need to use Javascript Injection or re-posting web pages.

For more information visit the home page of TamperData.

http://tamperdata.mozdev.org/

Visit this to understand its use step by step

http://jimbojw.com/wiki/index.php?title=Tamper_Data

The add-on link for mozilla firefox

https://addons.mozilla.org/en-US/firefox/addon/966

Tampering some of the shopping sites can be done using more of its concepts

Download the example given in GIF format

(size 4.5MB)http://www.4shared.com/file/60296573/22a512c2/Tamper_any_online_shop.html

For more google it !!