Mozilla has announced they are tweaking the Firefox release schedule for 2016. They still plan on pushing out the same amount of releases per year, just the timing between releases is going to fluctuate between 6 to 8 weeks.

Four years ago Mozilla moved to a fixed-schedule release model, otherwise known as theTrain 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.

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 (6 week cycle, release for critical fixes as needed)
2017-01-24 – Firefox 51 (6 weeks from prior release)