Four years ago Mozilla moved to a fixed-schedule release model, otherwise known as the Train Model, in which we released Firefox every six weeks to get features and updates to users faster and move at the speed of the Web. We studied the process carefully and learned a lot. We have also identified additional areas for improvement and it’s time we iterate again.

We are moving to a variably scheduled six-to-eight week release cycle for Firefox. With this new release cycle, we will deliver the same number of releases per year but gain a few significant benefits over the previous six week fixed model.

For example, we will now be able to adjust release dates to respond to emerging user and market needs and provide at least six working weeks for every release. We also want to help support the well-being and connectedness of our global Mozilla community by specifically allowing time for holidays.

You’ll find the 2016 Firefox release schedule listed below and in the following Wiki.

2016 Firefox Release Schedule

2016-01-26 – Firefox 44

2016-03-08 – Firefox 45, ESR 45 (6 weeks cycle)

2016-04-19 – Firefox 46 (6 weeks cycle)

2016-06-07 – Firefox 47 (7 weeks cycle)

2016-08-02 – Firefox 48 (8 weeks cycle)

2016-09-13 – Firefox 49 (6 weeks cycle)

2016-11-08 – Firefox 50 (8 weeks cycle)

2016-12-13 – Firefox 50.0.1 (5 week cycle, release for critical fixes as needed)

2017-01-24 – Firefox 51 (6 weeks from prior release)

Note: Firefox ESR will continue to ship point releases on the same day that Firefox ships.