Mozilla Firefox extensions for the pentester

Here i will list some of the most useful extensions for doing applications audits or pentest using Mozilla Firefox:

LiveHTTPheaders:

* Letting you edit request headers and replay an URL. Look for the Replay button in the live window! Very useful ;)
http://livehttpheaders.mozdev.org/

Web Developer Tools:
* Excellent tool, that let you do a lot of things, a must have. It turns the browser into a complete development Tool.
https://addons.mozilla.org/extensions/moreinfo.php?id=60

Switch Proxy Tools:
* This extension allows you to define a list of proxies and switch on the fly with a button, very fast! Tor, Paros, Burp, webscarab, jap.
https://addons.mozilla.org/extensions/moreinfo.php?id=125

Tamper Data:
* Use tamperdata to view and modify HTTP/HTTPS headers and post parameters. Trace and time http response/requests.
https://addons.mozilla.org/firefox/966/


Spiderzilla:
* A front end for httrack, you could create website mirrors from the browser.
https://addons.mozilla.org/addon.php?id=1616

Slogger:
* Slogger creates a complete log of your browsing history. It can save every page using the same options as the "Save Page As" command as well as saving a customizable plain text history file
https://addons.mozilla.org/extensions/moreinfo.php?id=143

Add n Edit Cookies:
*Cookie Editor that allows you add and edit "session" and saved cookies.
https://addons.mozilla.org/firefox/573/


If you got another interesting plugin, please share ;)