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Releases

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Current Releases

Standard support

Based on Gecko 37

Final-50slice.png
Firefox 37
Based on Gecko 37
Released on some date in the past
SM-50slice.png
SeaMonkey 2.34
Based on Gecko 37
Released on 2015-03-10

Based on Gecko 31

Thunderbird-50slice.png
Thunderbird 31.6.0
Based on Gecko 31
Released on some date in the past

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 31

Final-50slice.png
Firefox 31.6.0esr
Based on Gecko 31
Released on some date in the past

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 38

Final-50slice.png
Firefox 38
Based on Gecko 38
Currently in BETA channel
Moves to RELEASE week of May 12, 2015
Thunderbird-50slice.png
Thunderbird 38
Based on Gecko 38
Currently in BETA channel
SM-50slice.png
SeaMonkey 2.35
Based on Gecko 38
Currently in BETA channel
Moves to RELEASE week of May 12, 2015

Based on Gecko 39

Aurora-50slice.png
Firefox 39
Based on Gecko 39
Currently in AURORA channel
Moves to BETA week of May 12, 2015
Earlybird-50slice.png
Thunderbird 39
Based on Gecko 39
Currently in EARLYBIRD channel
Moves to BETA week of May 12, 2015
SM-50slice.png
SeaMonkey 2.36
Based on Gecko 39
Currently in AURORA channel
Moves to BETA week of May 12, 2015

Based on Gecko 40

Nightly-50slice.png
Firefox 40
Based on Gecko 40
Currently in NIGHTLY channel
Moves to AURORA week of May 12, 2015
Dailybird-50slice.png
Thunderbird 40
Based on Gecko 40
Currently in DAILY channel
Moves to EARLYBIRD week of May 12, 2015
SM-50slice.png
SeaMonkey 2.37
Based on Gecko 40
Currently in NIGHTLY channel
Moves to AURORA week of May 12, 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

2015

Release Date Notes
SeaMonkey 2.33.1 March 23 Release Notes
SeaMonkey 2.33 March 10 Release Notes
Thunderbird 31.5.0 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.