This extension protects yourself against punycode domains phishing attacks that try to impersonate well known sites (including most banks online) by replacing some letters with the same character with a small dot bellow, that most people ignore/don't notice it. In a real phishing attack (using this method), the little dot may be confused with a dead pixel or some dust on the screen. As an example you may consider the following domain: http://www.xn--goldmasachs-1x8e.com/ Despict the small do bellow the lowercase N character, it might be easily confused with: http://www.goldmansachs.com/ This extension will provide a warning dialog every time the browser tries to open Urls domains that are punycode encoded, which may be used to trick the user.