Anti-phishing software consists of computer programs that attempt to identify phishing content contained in websites, e-mail, or other forms used to accessing data (usually from the internet) and block the content, usually with a warning to the user (and often an option to view the content regardless). It is often integrated with web browsers and email clients as a toolbar that displays the real domain name for the website the viewer is visiting, in an attempt to prevent fraudulent websites from masquerading as other legitimate websites. Most popular web browsers comes with built-in anti-phishing and anti-malware protection services, but almost none of the alternate web browsers have such protections. Password managers can also be used to help defend against phishing, as can some mutual authentication techniques. Notable client-based anti-phishing programs avast! Avira Premium Security Suite Earthlink ScamBlocker (discontinued) eBay Toolbar Egress Defend ESET Smart Security G Data Software G DATA Antivirus GeoTrust TrustWatch Google Safe Browsing (used in Mozilla Firefox, Google Chrome, Opera, Safari, and Vivaldi) Kaspersky Internet Security McAfee SiteAdvisor Microsoft SmartScreen (used in Microsoft Edge, Internet Explorer, and Microsoft Outlook) Mozilla Thunderbird Netcraft Toolbar Netscape Norton 360 Norton Internet Security PhishTank SiteChecker Quick Heal Windows Mail - default Windows Vista e-mail client WOT (Web Of Trust) - browser extension ZoneAlarm Service-based anti-phishing Google Safe Browsing OpenDNS PhishTank Anti-phishing effectiveness An independent study conducted by Carnegie Mellon University CyLab titled "Phinding Phish: An Evaluation of Anti-Phishing Toolbars" and released November 13, 2006 tested the ability of ten anti-phishing solutions to block or warn about known phishing sites and not block or warn about legitimate sites (not exhibit false-positives), as well as the usability of each solution. Of the solutions tested, Netcraft Toolbar, EarthLink ScamBlocker and SpoofGuard were able to correctly identify over 75% of the sites tested, with Netcraft Toolbar receiving the highest score without incorrectly identifying legitimate sites as phishing. Severe problems were however discovered using SpoofGuard, and it incorrectly identified 38% of the tested legitimate sites as phishing, leading to the conclusion that "such inaccuracies might nullify the benefits SpoofGuard offers in identifying phishing sites." Google Safe Browsing (which has since been built into Firefox) and Internet Explorer both performed well, but when testing ability to detect fresh phishes Netcraft Toolbar scored as high as 96%, while Google Safe Browsing scored as low as 0%, possibly due to technical problems with Google Safe Browsing. The testing was