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:
- Firefox Merge/Release Dates (ICS for Thunderbird/Lightning or your calendar app) (low noise)
- Firefox Merge/Release Full Scheduling Calendar (ICS) (highly detailed - 99.99% up to date)
Future branch dates
| 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.