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Releases

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Current Releases

Standard support

Based on Gecko 39

Final-50slice.png
Firefox 39
Based on Gecko 39
Released on some date in the past
SM-50slice.png
SeaMonkey 2.36
Based on Gecko 39
Released on 2014-03-19

Based on Gecko 28

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

Based on Gecko 38

Thunderbird-50slice.png
Thunderbird 38.1.0
Based on Gecko 38
Released on some date in the past

Extended support

Based on Gecko 38

Final-50slice.png
Firefox 38.1.0esr
Based on Gecko 38
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 40

Final-50slice.png
Firefox 40
Based on Gecko 40
Currently in BETA channel
Moves to RELEASE week of August 11, 2015
Fxos-50slice.png.png
Firefox OS 1.4
Based on Gecko 40
Currently in BETA channel
Moves to RELEASE week of August 11, 2015
Thunderbird-50slice.png
Thunderbird 40
Based on Gecko 40
Currently in BETA channel
SM-50slice.png
SeaMonkey 2.37
Based on Gecko 40
Currently in BETA channel
Moves to RELEASE week of August 11, 2015

Based on Gecko 41

Aurora-50slice.png
Firefox 41
Based on Gecko 41
Currently in AURORA channel
Moves to BETA week of August 11, 2015
Earlybird-50slice.png
Thunderbird 41
Based on Gecko 41
Currently in EARLYBIRD channel
Moves to BETA week of August 11, 2015
SM-50slice.png
SeaMonkey 2.38
Based on Gecko 41
Currently in AURORA channel
Moves to BETA week of August 11, 2015

Based on Gecko 42

Nightly-50slice.png
Firefox 42
Based on Gecko 42
Currently in NIGHTLY channel
Moves to AURORA week of August 11, 2015
Fxosdev-50slice.png
Firefox OS 2.0
Based on Gecko 32
Currently in NIGHTLY channel
Moves to AURORA week of June 10, 2014
Dailybird-50slice.png
Thunderbird 42
Based on Gecko 42
Currently in DAILY channel
Moves to EARLYBIRD week of August 11, 2015
SM-50slice.png
SeaMonkey 2.39
Based on Gecko 42
Currently in NIGHTLY channel
Moves to AURORA week of August 11, 2015

Previous Releases

2014

Release Date Notes
Firefox 29.0.1 May 9 Release Notes
Firefox 29.0.1 for Android May 9 Release Notes
Firefox 29.0 April 29 Release Notes
Firefox 24.5.0esr April 29 Release Notes
Firefox 29.0 for Android April 29 Release Notes
SeaMonkey 2.25 March 19 Release Notes
Thunderbird 24.4.0 March 18 Release Notes
Firefox 28.0 March 18 Release Notes
Firefox 24.4.0esr March 18 Release Notes
Firefox 28.0 for Android March 18 Release Notes
Firefox 27.0.1 February 13 Release Notes
SeaMonkey 2.24 February 6 Release Notes
Thunderbird 24.3.0 February 4 Release Notes
Firefox 27.0 February 4 Release Notes
Firefox 24.3.0esr February 4 Release Notes
Firefox 27.0 for Android February 4 Release Notes

2013 and earlier

For releases prior to 2014, 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.