The NoScript Firefox extension provides extra protection for Firefox, Seamonkey and other Mozilla-based browsers. Its aim is to allow active content to run only from sites you trust, and protect yourself against XSS and Click-jacking attacks. It is also useful to prevent Flash running on the browser.  But its main advantage could be the alerts given on its interface. There is an increasing number of Web sites that cannot run without non-free JavaScript programs downloaded and executed on the visitor's computer. Richard Stallman first raised this another concern with his article 