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.
JavaScript Blacklist is a simple extension for Safari 5 which blacklists scripts from a configurable list of domains. If a common "utility" script used by sites that you visit is annoying you, this will let you opt out quickly and easily.
view and modify HTTP/HTTPS headers and post parameters
