With FF 7 being released tomorrow Mozilla is considering a new modified release schedule with one release for consumers and another for corporations.
Mozilla proposes not-so-rapid-release Firefox | Deep Tech - CNET News
Under the proposal, Mozilla would issue a new Extended Support Release (ESR) version of Firefox every 30 weeks. That's five times slower than the new rapid-release cycle for regular Firefox, which updates the browser every six weeks. And each version would be supported for 42 weeks under the proposal.