RapidRelease/Calendar

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This schedule is based on the current RapidRelease plan. Future dates may change if the process changes. Code is not always released to users on the same day as the branch migration. The release to users may be a few days later, to allow for manual testing and sign-off.

Calendars

This wiki page may not always have the most current information. Please refer to one of the following calendars for up-to-date scheduling:

Future branch dates

quarter merge date central aurora beta release date release ESR
Q3 2016-08-01 Firefox 51 Firefox 50 Firefox 49 2016-08-02 Firefox 48 Firefox 45.3
2016-09-12 Firefox 52 Firefox 51 Firefox 50 2016-09-13 Firefox 49 Firefox 45.4
Q4 2016-11-07 Firefox 53 Firefox 52 Firefox 51 2016-11-08 Firefox 50 Firefox 45.5
2016-12-13 Firefox 50.0.1 Firefox 45.5.1
Q1 2017-01-23 Firefox 54 Firefox 53 Firefox 52 2017-01-24 Firefox 51 Firefox 45.6
TBA Firefox 55 Firefox 54 Firefox 53 TBA Firefox 52 Firefox 45.7; 52.0

Note that the merge from beta to release happens ahead of time (usually on the Mon/Tue a week before the release date). Release manager list

Past branch dates

More details on contents of releases can be found in Wikipedia: Firefox release history.

merge date central aurora beta release date release ESR
2016-06-06 Firefox 50 Firefox 49 Firefox 48 2016-06-07 Firefox 47 Firefox 45.2
2016-04-25 Firefox 49 Firefox 48 Firefox 47 2016-04-26 Firefox 46 Firefox 38.8; 45.1
2016-03-07 Firefox 48 Firefox 47 Firefox 46 2016-03-08 Firefox 45 Firefox 38.7; 45.0
2016-01-25 Firefox 47 Firefox 46 Firefox 45 2016-01-26 Firefox 44 Firefox 38.6
2015-12-14 Firefox 46 Firefox 45 Firefox 44 2015-12-15 Firefox 43 Firefox 38.5
2015-10-29 Firefox 45 Firefox 44 Firefox 43 2015-11-03 Firefox 42 Firefox 38.4
2015-09-21 Firefox 44 Firefox 43 Firefox 42 2015-09-22 Firefox 41 Firefox 38.3
2015-08-10 Firefox 43 Firefox 42 Firefox 41 2015-08-11 Firefox 40 Firefox 38.2
2015-06-29 Firefox 42 Firefox 41 Firefox 40 2015-06-30 Firefox 39 Firefox 31.8; 38.1
2015-06-02 Firefox 38.0.5
2015-05-11* Firefox 41 Firefox 40 Firefox 39 2015-05-12* Firefox 38 Firefox 31.7; 38.0
2015-03-30* Firefox 40 Firefox 39 Firefox 38 2015-03-31* Firefox 37 Firefox 31.6
2015-02-23 Firefox 39 Firefox 38 Firefox 37 2015-02-24 Firefox 36 Firefox 31.5
2015-01-12* Firefox 38 Firefox 37 Firefox 36 2015-01-13* Firefox 35 Firefox 31.4
2014-11-28* Firefox 37 Firefox 36 Firefox 35 2014-12-01* Firefox 34 Firefox 31.3
2014-10-13 Firefox 36 Firefox 35 Firefox 34 2014-10-14 Firefox 33 Firefox 31.2
2014-09-02* Firefox 35 Firefox 34 Firefox 33 2014-09-02 Firefox 32 Firefox 24.8; 31.1
2014-07-21 Firefox 34 Firefox 33 Firefox 32 2014-07-22 Firefox 31 Firefox 24.7; 31.0
2014-06-09 Firefox 33 Firefox 32 Firefox 31 2014-06-10 Firefox 30 Firefox 24.6
2014-04-28 Firefox 32 Firefox 31 Firefox 30 2014-04-29 Firefox 29 Firefox 24.5
2014-03-17 Firefox 31 Firefox 30 Firefox 29 2014-03-18 Firefox 28 Firefox 24.4
2014-02-03* Firefox 30 Firefox 29 Firefox 28 2014-02-04* Firefox 27 Firefox 24.3
2013-12-09 Firefox 29 Firefox 28 Firefox 27 2013-12-10 Firefox 26 Firefox 24.2
2013-10-28 Firefox 28 Firefox 27 Firefox 26 2013-10-29 Firefox 25 Firefox 17.0.10; 24.1
2013-09-16 Firefox 27 Firefox 26 Firefox 25 2013-09-17 Firefox 24 Firefox 17.0.9; 24.0
2013-08-05 Firefox 26 Firefox 25 Firefox 24 2013-08-06 Firefox 23 Firefox 17.0.8
2013-06-24 Firefox 25 Firefox 24 Firefox 23 2013-06-25 Firefox 22 Firefox 17.0.7
2013-05-13 Firefox 24 Firefox 23 Firefox 22 2013-05-14 Firefox 21 Firefox 17.0.6
2013-04-01 Firefox 23 Firefox 22 Firefox 21 2013-04-02 Firefox 20 Firefox 17.0.5
2013-02-19* Firefox 22 Firefox 21 Firefox 20 2013-02-19 Firefox 19 Firefox 17.0.3
2013-01-07* Firefox 21 Firefox 20 Firefox 19 2013-01-08* Firefox 18 Firefox 10.0.12; 17.0.2
2012-11-19 Firefox 20 Firefox 19 Firefox 18 2012-11-20 Firefox 17 Firefox 10.0.11; 17.0
2012-10-08 Firefox 19 Firefox 18 Firefox 17 2012-10-09 Firefox 16 Firefox 10.0.8
2012-08-27 Firefox 18 Firefox 17 Firefox 16 2012-08-28 Firefox 15 Firefox 10.0.7
2012-07-16 Firefox 17 Firefox 16 Firefox 15 2012-07-17 Firefox 14 Firefox 10.0.6
2012-06-05 Firefox 16 Firefox 15 Firefox 14 2012-06-05 Firefox 13 Firefox 10.0.5
2012-04-24 Firefox 15 Firefox 14 Firefox 13 2012-04-24 Firefox 12 Firefox 10.0.4
2012-03-13 Firefox 14 Firefox 13 Firefox 12 2012-03-13 Firefox 11 Firefox 10.0.3
2012-01-31 Firefox 13 Firefox 12 Firefox 11 2012-01-31 Firefox 10 Firefox 10.0
2011-12-20 Firefox 12 Firefox 11 Firefox 10 2011-12-20 Firefox 9
2011-11-08 Firefox 11 Firefox 10 Firefox 9 2011-11-08 Firefox 8
2011-09-27 Firefox 10 Firefox 9 Firefox 8 2011-09-27 Firefox 7
2011-08-16 Firefox 9 Firefox 8 Firefox 7 2011-08-16 Firefox 6
2011-07-05 Firefox 8 Firefox 7 Firefox 6
2011-06-21 Firefox 5
2011-05-24 Firefox 7 Firefox 6
2011-05-17 Firefox 5
2011-04-12 Firefox 6 Firefox 5

*Some release dates and merge dates are rescheduled to avoid conflicts with holidays.

Notes:

  • Irregular scheduling starting 2016.
  • Six week schedule from 2011 to 2015 (with some dates delayed to avoid conflicts with holidays).
  • Firefox 5 was on a slightly different schedule. It spent five weeks each on Aurora and Beta while later releases spent six weeks on each branch.