Firefox to US$7,500 cash reward) to researchers who discover severe security holes in Firefox. Official guidelines for handling security vulnerabilities discourage early disclosure of vulnerabilities so as not to give potential attackers an advantage in creating exploits. Because Firefox generally has fewer publicly known security vulnerabilities than Internet Explorer (see "Comparison of web browsers"), improved security is often cited as a reason to switch from Internet Explorer to Firefox. "The Washington Post" reported that exploit code for known critical security vulnerabilities in Internet Explorer was available for 284 days in 2006. In comparison, exploit code for known, critical security vulnerabilities in
Kogan.com the combined time of designing for Chrome, Safari and Firefox." Kogan accepted that it was unlikely that anyone would actually pay the charges, stating that the goal of the campaign was to encourage users to download a more up-to-date version of Internet Explorer, or a different browser. The 'tax' was the most talked about topic on social media service Twitter on the day following its launch. Several weeks later, search results for kogan.com disappeared from Microsoft Bing search results, with Kogan stating "We hope Microsoft were not too offended by what we did with the IE7 tax and this is