NoScript Security Suite
IMPORTANT A Basic NoScript 10 Guide
Still confused by NoScript 10's new UI? Check this user-contributed NoScript 10 primer. and this NoScript 10 "Quantum" vs NoScript 5 "Classic" (or "Legacy") comparison.
Winner of the "PC World World Class Award" and bundled with the Tor Browser, NoScript gives you with the best available protection on the web.
It protects your "trust boundaries" against cross-site scripting attacks (XSS), cross-zone DNS rebinding / CSRF attacks (router hacking), and Clickjacking attempts, thanks to its unique ClearClick technology.
Such a preemptive approach prevents exploitation of security vulnerabilities (known and even unknown!) with no loss of functionality where you need it. Experts do agree: Firefox is really safer with NoScript ;-)