NoScript Security Suite for Firefox

Developer's DescriptionBy Giorgio MaoneAllow active content to run only from sites you trust.It allows JavaScript, Java and other executable content to run only from trusted domains of your choice, e.g. your home-banking site, guarding 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. It also implements the DoNotTrack tracking opt-out proposal by default.Such a preemptive approach prevents exploitation of security vulnerabilities (known and even unknown!) with no loss of functionality where you need it.