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About this Add-on
Attackers might be able to alter the page you are seeing or can to steal private information like passwords on web sites vulnerable to XSS. noXSS tries to protect you while you are visiting such insecure sites.
More on XSS can be found here: http://en.wikipedia.org/wiki/Cross-site_scripting
Please note that that the current version of noXSS is not complete yet. While protecting against many common XSS attacks there are still ways to trick noXSS.