Mozilla has officially ended all support for Firefox 3.6 with the release of Firefox 12.
Originally released on January 21, 2010 as "Namoroka", the browser is phased out with version 3.6.28. Mozilla offered the first replacement for 3.6 with Firefox 4, which was released on March 22, 2011. According to StatCounter, Firefox 3.6 has still a market share of about 2.9 percent.
Mozilla has been entangled in a controversy of browser support time frames when it introduced its rapid release schedule with Firefox 5, which schedules a new browser version every six weeks. Businesses complained that they would not have the ability to update their corporate users as well as software manuals at this pace. The browser maker recently addressed these concerns with the release of extended support release (ESR) versions of Firefox, which provides a 54-week support period for a browser release. While updated every six weeks, these releases only receive security updates and not the feature updates that are included in the regular desktop browser updates.
The current ESR release is Firefox 10.0.4 ESR, which will be supported until February 12, 2013 as version 10.0.8. Mozilla will launch the next ESR version as Firefox 17.0 ESR on November 12, 2012, which provides businesses ample time to transition to the new browser version.