Multifox is an extension that allows Firefox to connect to websites using different user names. Simultaneously! For example, if you have multiple Gmail accounts, you can open them all at the same time. Each Firefox window, managed by Multifox, accesses an account without interfering each other.
The idea behind the Application Boundaries Enforcer (ABE) module is hardening the web application oriented protections already provided by NoScript, by developing a firewall-like component running inside the browser.
Firefox masterpassword bruteforcer
view and modify HTTP/HTTPS headers and post parameters
Secure Login is a login extension for Mozilla Firefox integrated password manager.