In January 2012, Mozilla rolled out Firefox 10, just 6 weeks after introducing Firefox 9. Firefox is known for its rapid-release schedule, and with Firefox 11 set for release later today, there is no sign of slowing down. The most recent version of Firefox is known for its JavaScript and speed, and also marks the launch of Extended Support Release (ESR) for large businesses or organizations. ESR means these organizations can centrally deploy the latest version of Firefox and receive security updates throughout the year, but these updates will not make any changes to the web or any add-ons they may have downloaded.
With the imminent release of Firefox version 11 and 12, a total of 3 version updates will have been released between January and April 2012, and a total of 7 major updates since the start of 2011. Chitika Insights wanted to take a look into the current state of Firefox version fragmentation to get a sense for current levels of adoption among users. Using data comprised of a sample of hundreds of millions of ad impressions from February 2012, Chitika Insights looked at the total web share of Firefox users and then calculated the distribution of impressions for each version Firefox used in this study.