Here is a great add-on for Firefox/Iceweasel:
https://addons.mozilla.org/en-US/firefox/addon/966
The Tamper Data add-on allows you to arbitrarily modify all your POST and GET data before submitting an HTML form. After installing Tamper Data, you can open it anytime from the Tools menu. Once it is open, you can switch in and out of tamper mode. When you are in tamper mode, each time you hit the submit button on a form, a window appears asking you if you want to tamper with the action data.
The primary benefit of Tamper Data for me is in my light web-development work. It allows me to test, for example, my PHP/MySQL code for vulnerabilities, by allowing me to easily pass malformed or malicious data in POST transmissions.
https://addons.mozilla.org/en-US/firefox/addon/966
The Tamper Data add-on allows you to arbitrarily modify all your POST and GET data before submitting an HTML form. After installing Tamper Data, you can open it anytime from the Tools menu. Once it is open, you can switch in and out of tamper mode. When you are in tamper mode, each time you hit the submit button on a form, a window appears asking you if you want to tamper with the action data.
The primary benefit of Tamper Data for me is in my light web-development work. It allows me to test, for example, my PHP/MySQL code for vulnerabilities, by allowing me to easily pass malformed or malicious data in POST transmissions.
Nifty, That..