The NoScript Firefox extension provides extra protection for Firefox, Seamonkey and other mozilla-based browsers: this free, open source add-on allows JavaScript, Java, Flash and other plugins to be executed only by trusted web sites of your choice (e.g. your online bank). NoScript also provides the most powerful anti-XSS and anti-Clickjacking protection ever available in a browser.

NoScript’s unique whitelist based pre-emptive script blocking approach prevents exploitation of security vulnerabilities (known and even not known yet!) with no loss of functionality…

Features
* Anti-XSS with HTTP proxies
* Blocked objects menu
* Anti-XXS-filter

Conclusion
The small but useful extension NoScript appears as an icon in the browser bar. It is thus easy to access and operate. By default, the add-on is so set that it eliminates any JavaScripts on web pages. The scripts are allowed only with the consent of the user. So, corresponding vulnerabilities cannot be exploited.