Extended Support Release (ESR)

      Mozilla has announced plans to offer an annual Extended Support Release (ESR) of Firefox for enterprises and other adopters that don't want to keep up with the browser's new rapid release cycle. Each ESR will receive regular security patches, but will not be updated with new functionality until the next ESR becomes available.... "

January 10, 2012

Source: Arstechnica.com
More Firefox extended support will mitigate rapid release challenges