Releases

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Current Releases

Standard support

Based on Gecko 40

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Firefox 40
Based on Gecko 40
Released on 2015-08-11
SM-50slice.png
SeaMonkey 2.37
Based on Gecko 40
Released on TBD

Based on Gecko 38

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Thunderbird 38.2
Based on Gecko 38
Released on 2015-08-11

Based on Gecko 28

Fxos-50slice.png.png
Firefox OS 1.3
Based on Gecko 28
Released on 2014-03-17

Extended support

Based on Gecko 38

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Firefox 38.2.0esr
Based on Gecko 38
Released on 2015-08-11

Upcoming Releases

NOTE: The dates listed in this section refer to the date of the code merge, not the date of release. See the branch migration calendar for more information.

Based on Gecko 41

Final-50slice.png
Firefox 41
Based on Gecko 41
Currently in BETA channel
Moves to RELEASE week of September 22, 2015
Thunderbird-50slice.png
Thunderbird 41
Based on Gecko 41
Currently in BETA channel
SM-50slice.png
SeaMonkey 2.38
Based on Gecko 41
Currently in BETA channel
Moves to RELEASE week of September 22, 2015

Based on Gecko 42

Aurora-50slice.png
Firefox 42
Based on Gecko 42
Currently in AURORA channel
Moves to BETA week of September 22, 2015
Earlybird-50slice.png
Thunderbird 42
Based on Gecko 42
Currently in EARLYBIRD channel
Moves to BETA week of September 22, 2015
SM-50slice.png
SeaMonkey 2.39
Based on Gecko 42
Currently in AURORA channel
Moves to BETA week of September 22, 2015

Based on Gecko 43

Nightly-50slice.png
Firefox 43
Based on Gecko 43
Currently in NIGHTLY channel
Moves to AURORA week of September 22, 2015
Dailybird-50slice.png
Thunderbird 43
Based on Gecko 43
Currently in DAILY channel
Moves to EARLYBIRD week of September 22, 2015
SM-50slice.png
SeaMonkey 2.40
Based on Gecko 43
Currently in NIGHTLY channel
Moves to AURORA week of September 22, 2015

B2G Releases

Fxos-50slice.png.png
Firefox OS 1.4
Based on Gecko 30
Released on ??
Fxos-50slice.png.png
Firefox OS 2.0
Based on Gecko 32
Currently in BETA channel
Moves to RELEASE week of ??
Fxosdev-50slice.png
Firefox OS 2.1
Based on Gecko 34
Currently in AURORA channel
Moves to BETA week of ??
Fxosdev-50slice.png
Firefox OS 2.2
Based on Gecko 37
Currently in NIGHTLY channel
Moves to AURORA week of ??

Previous Releases

More details of the RapidRelease Calendar

2015

Release Date Notes
Firefox 40.0.3 August 27 Release Notes
Thunderbird 38.2.0 August 14 Release Notes
Firefox 40.0.2 August 13 Release Notes
Firefox 40 August 11 Release Notes
Firefox 39.0.3 August 6 Release Notes
Thunderbird 31.8.0 July 17 Release Notes
Thunderbird 38.1.0 July 9 Release Notes
Firefox 39 July 02 Release Notes
Thunderbird 38.0.1 June 11 Release Notes
Firefox 38.0.5 June 2 Release Notes
Thunderbird 31.7.0 May 12 Release Notes
Firefox 38.0.1 May 14 Release Notes
Firefox 38 May 12 Release Notes
Firefox 37.0.2 April 20 Release Notes
Firefox 37.0.1 April 3 Release Notes
Thunderbird 31.6.0 March 31 Release Notes
Firefox 37 March 31 Release Notes
SeaMonkey 2.33.1 March 23 Release Notes
Firefox 36.0.4 March 21 Release Notes
Firefox 36.0.3 March 20 Release Notes
SeaMonkey 2.33 March 10 Release Notes
Firefox 36.0.1 March 5 Release Notes
Thunderbird 31.5.0 February 24 Release Notes
Firefox 36.0 February 24 Release Notes
SeaMonkey 2.32 January 13 Release Notes
Thunderbird 31.4.0 January 13 Release Notes
Firefox 35.0 January 13 Release Notes

2014 and earlier

For releases prior to 2015, see the archive.

Other Links

This is a page for tracking in-progress releases. For maintenance releases, we use a general checklist to ensure we don't miss anything.