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
Web typography SVGOpenTypeFonts. Firefox has supported SVG OpenType since Firefox 26. Linking to industry-standard "TrueType" (TTF) and "OpenType" (TTF/OTF) fonts is supported by Mozilla Firefox 3.5+, Opera 10+, Safari 3.1+, and Google Chrome 4.0+. Internet Explorer 9+ supports only those fonts with embedding permissions set to installable. The Web Open Font Format (WOFF) is essentially OpenType or TrueType with compression and additional metadata. WOFF is supported by Mozilla Firefox 3.6+, Google Chrome 5+, Opera Presto, and is supported by Internet Explorer 9 (since March 14, 2011). Support is available on Mac OS X Lion's Safari from release 5.1. Only two fonts available