Firefox increasing rate since Firefox 1.0 was released on November 9, 2004, and Firefox had already been downloaded over one billion times. This number does not include downloads using software updates or those from third-party websites. They do not represent a user count, as one download may be installed on many machines, one person may download the software multiple times, or the software may be obtained from a third-party. In July 2010, IBM asked all employees (about 400,000) to use Firefox as their default browser. Firefox was the second-most used web browser until November 2011, when Google Chrome surpassed it. According
Kerning some complex typesetting functions that may be hard to implement through plug-ins (kerning in particular) may be relatively easy to implement through separate tools. The CSS property codice_1 enables kerning in Firefox, Chrome, Safari, Opera, and the Android Browser. There is also a proposed CSS3 property codice_2, but it is only supported in Firefox (prefixed with codice_3), Chrome and Opera (prefixed with codice_4 in both) and in Internet Explorer starting at version 10. The CSS3 draft suggests that kerning should always be enabled for OpenType fonts. The human perception of kerning can vary with the intraword and interword spacing during