Firefox Release Calendar

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Warning: This page will soon be deprecated. Please use whattrainisitnow.com/calendar instead.

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. Thunderbird tracks the ESR schedule column per Thunderbird release info.

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

Release Owners

Quarter Soft Freeze Merge Date Nightly Beta Release Date Release ESR
Q2 2023 2023-04-06 2023-04-10 Firefox 114 Firefox 113 2023-04-11 Firefox 112 Firefox 102.10
2023-05-04 2023-05-08 Firefox 115 Firefox 114 2023-05-09 Firefox 113 Firefox 102.11
2023-06-01 2023-06-05 Firefox 116 Firefox 115 2023-06-06 Firefox 114 Firefox 102.12
Q3 2023 2023-06-29 2023-07-03 Firefox 117 Firefox 116 2023-07-04 Firefox 115 Firefox 102.13; 115.0
2023-07-27 2023-07-31 Firefox 118 Firefox 117 2023-08-01 Firefox 116 Firefox 102.14; 115.1
2023-08-24 2023-08-28 Firefox 119 Firefox 118 2023-08-29 Firefox 117 Firefox 102.15; 115.2
2023-09-21 2023-09-25 Firefox 120 Firefox 119 2023-09-26 Firefox 118 Firefox 115.3
Q4 2023 2023-10-19 2023-10-23 Firefox 121 Firefox 120 2023-10-24 Firefox 119 Firefox 115.4
2023-11-16 2023-11-20 Firefox 122 Firefox 121 2023-11-21 Firefox 120 Firefox 115.5
2023-12-14 2023-12-18 Firefox 123 Firefox 122 2023-12-19 Firefox 121 Firefox 115.6
Quarter Fx Release Nightly begins Nightly Soft Freeze* Beta begins Releases on Corresponding ESR
Q2 2023 Firefox 112 2023-02-13 2023-03-09 2023-03-13 2023-04-11 Firefox 102.10
Firefox 113 2023-03-13 2023-04-06 2023-04-10 2023-05-09 Firefox 102.11
Firefox 114 2023-04-10 2023-05-04 2023-05-08 2023-06-06 Firefox 102.12
Q3 2023 Firefox 115 2023-05-08 2023-06-01 2023-06-05 2023-07-04 Firefox 102.13; 115.0
Firefox 116 2023-06-05 2023-06-29 2023-07-04 2023-08-01 Firefox 102.14; 115.1
Firefox 117 2023-07-04 2023-07-27 2023-07-31 2023-08-29 Firefox 102.15; 115.2
Firefox 118 2023-07-31 2023-08-24 2023-08-28 2023-09-26 Firefox 115.3
Q4 2023 Firefox 119 2023-08-28 2023-09-21 2023-09-25 2023-10-24 Firefox 115.4
Firefox 120 2023-09-25 2023-10-19 2023-10-23 2023-11-21 Firefox 115.5
Firefox 121 2023-10-23 2023-11-16 2023-11-20 2023-12-19 Firefox 115.6

* The Nightly soft freeze is typically during the week prior to merge day. During this period high-risk patches should avoid landing until after the Nightly version bump lands on mozilla-central on merge day.

Past branch dates

More details on contents of releases can be found in the release notes archive or Wikipedia: Firefox version history.

Fx Release Nightly began Nightly Soft Freeze Beta began Released on Corresponding ESR
Firefox 111 2023-01-16 2023-02-09 2023-02-13 2023-03-14 Firefox 102.9
Firefox 110 2022-12-12 2023-01-12 2023-01-16 2023-02-14 Firefox 102.8
Firefox 109 2022-11-15 2022-12-08 2022-12-13 2023-01-17 Firefox 102.7
Firefox 108 2022-10-18 2022-11-10 2022-11-15 2022-12-13 Firefox 102.6
Firefox 107 2022-09-20 2022-10-13 2022-10-18 2022-11-15 Firefox 102.5
Firefox 106 2022-08-23 2022-09-15 2022-09-20 2022-10-18 Firefox 102.4
Firefox 105 2022-07-26 2022-08-18 2022-08-23 2022-09-20 Firefox 102.3
Firefox 104 2022-06-28 2022-07-21 2022-07-26 2022-08-23 Firefox 91.13; 102.2
Firefox 103 2022-05-31 2022-06-23 2022-06-28 2022-07-26 Firefox 91.12; 102.1
Firefox 102 2022-05-03 2022-05-26 2022-05-31 2022-06-28 Firefox 91.11; 102.0
Firefox 101 2022-04-05 2022-04-28 2022-05-03 2022-05-31 Firefox 91.10
Firefox 100 2022-03-08 2022-03-31 2022-04-05 2022-05-03 Firefox 91.9
Firefox 99 2022-02-08 2022-03-03 2022-03-08 2022-04-05 Firefox 91.8
Firefox 98 2022-01-11 2022-02-03 2022-02-08 2022-03-08 Firefox 91.7
Firefox 97 2021-12-07 2021-01-06 2022-01-11 2022-02-08 Firefox 91.6
Firefox 96 2021-11-02 2021-12-02 2021-12-07 2022-01-11 Firefox 91.5
Firefox 95 2021-10-05 2021-10-28 2021-11-02 2021-12-07 Firefox 91.4
Firefox 94 2021-09-07 2021-09-30 2021-10-05 2021-11-02 Firefox 91.3
Firefox 93 2021-08-10 2021-09-02 2021-09-07 2021-10-05 Firefox 78.15; 91.2
Firefox 92 2021-07-13 2021-08-05 2021-08-10 2021-09-07 Firefox 78.14; 91.1
Firefox 91 2021-06-01 2021-07-08 2021-07-13 2021-08-10 Firefox 78.13; 91.0
Firefox 90 2021-04-19 2021-05-27 2021-06-01 2021-07-13 Firefox 78.12
Firefox 89 2021-03-23 2021-04-15 2021-04-20 2021-06-01 Firefox 78.11
Firefox 88 2021-02-23 2021-03-18 2021-03-23 2021-04-19 Firefox 78.10
Firefox 87 2021-01-26 2021-02-18 2021-02-23 2021-03-23 Firefox 78.9
Firefox 86 2020-12-15 2021-01-21 2021-01-26 2021-02-23 Firefox 78.8
Firefox 85 2020-11-17 2020-12-10 2020-12-15 2021-01-26 Firefox 78.7
Firefox 84 2020-10-20 2020-11-12 2020-11-17 2020-12-15 Firefox 78.6
Firefox 83 2020-09-22 2020-10-15 2020-10-20 2020-11-17 Firefox 78.5
Firefox 82 2020-08-25 2020-09-17 2020-09-22 2020-10-20 Firefox 78.4
Firefox 81 2020-07-28 2020-08-20 2020-08-24 2020-09-22 Firefox 78.3
Firefox 80 2020-06-30 2020-07-23 2020-07-27 2020-08-25 Firefox 68.12; 78.2
Firefox 79 2020-06-02 2020-06-26 2020-06-29 2020-07-28 Firefox 68.11; 78.1
Firefox 78 2020-05-04 2020-05-28 2020-06-01 2020-06-30 Firefox 68.10; 78.0
Firefox 77 2020-04-06 2020-04-30 2020-05-04 2020-06-02 Firefox 68.9
Firefox 76 2020-03-09 2020-04-02 2020-04-06 2020-05-05 Firefox 68.8
Firefox 75 2020-02-10 2020-03-05 2020-03-09 2020-04-07 Firefox 68.7
Firefox 74 2020-01-06 2020-02-06 2020-02-10 2020-03-10 Firefox 68.6
Firefox 73 2019-12-02 2020-01-02 2020-01-06 2020-02-11 Firefox 68.5
Firefox 72 2019-10-21 2019-11-25 2019-12-02 2020-01-07 Firefox 68.4
Firefox 71 2019-09-02 2019-10-14 2019-10-21 2019-12-03 Firefox 68.3
Firefox 70 2019-07-08 2019-08-26 2019-09-02 2019-10-22 Firefox 68.2
Firefox 69 2019-05-20 2019-07-01 2019-07-08 2019-09-03 Firefox 60.9; 68.1
Firefox 68 2019-03-18 2019-05-13 2019-05-20 2019-07-09 Firefox 60.8; 68.0
Firefox 67 2019-01-28 2019-03-11 2019-03-18 2019-05-21 Firefox 60.7
Firefox 66 2019-12-10 2019-01-21 2019-01-28 2019-03-19 Firefox 60.6
Firefox 65 2018-10-22 2018-12-03 2018-12-10 2019-01-29 Firefox 60.5
Firefox 64 2018-09-05 2018-10-15 2018-10-22 2018-12-11 Firefox 60.4
Firefox 63 2018-06-26 2018-08-21 2018-08-28 2018-10-23 Firefox 60.3
Merge Date Central Beta Release Date Release ESR
2018-09-04 Firefox 64 Firefox 63 2018-09-05 Firefox 62 Firefox 60.2
2018-06-25 Firefox 63 Firefox 62 2018-06-26 Firefox 61 Firefox 52.9; 60.1
2018-05-07 Firefox 62 Firefox 61 2018-05-09 Firefox 60 Firefox 52.8; 60.0
2018-03-12 Firefox 61 Firefox 60 2018-03-13 Firefox 59 Firefox 52.7
2018-01-22 Firefox 60 Firefox 59 2018-01-23 Firefox 58 Firefox 52.6
2017-11-13 Firefox 59 Firefox 58 2017-11-14 Firefox 57 Firefox 52.5
2017-09-21 Firefox 58 Firefox 57 2017-09-28 Firefox 56 Firefox 52.4
2017-08-02 Firefox 57 Firefox 56 2017-08-08 Firefox 55 Firefox 52.3
2017-06-12 Firefox 56 Firefox 55 2017-06-13 Firefox 54 Firefox 52.2
2017-04-18 Firefox 55 Firefox 54 2017-04-19 Firefox 53 Firefox 45.9; 52.1
Merge Date Central Aurora Beta Release Date Release ESR
2017-03-06 Firefox 55 Firefox 54 Firefox 53 2017-03-07 Firefox 52 Firefox 45.8; 52.0
2017-01-23 Firefox 54 Firefox 53 Firefox 52 2017-01-24 Firefox 51 Firefox 45.7
2016-12-13 Firefox 50.1.0 Firefox 45.6
2016-11-14 Firefox 53 Firefox 52 Firefox 51 2016-11-15 Firefox 50 Firefox 45.5
2016-09-19 Firefox 52 Firefox 51 Firefox 50 2016-09-20 Firefox 49 Firefox 45.4
2016-08-01 Firefox 51 Firefox 50 Firefox 49 2016-08-02 Firefox 48 Firefox 45.3
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:

  • Four week schedule starting late 2019.
  • Irregular schedule targeting six to eight week intervals, adjusting for holidays, 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.