Releases

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Current Releases

Standard support

Based on Gecko 44

Final-50slice.png
Firefox 44
Based on Gecko 44
Released on some date in the past
SM-50slice.png
SeaMonkey 2.41
Based on Gecko 44
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 38.6.0
Based on Gecko 38
Released on some date in the past

Extended support

Based on Gecko 38

Final-50slice.png
Firefox 38.6.0esr
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 45

Final-50slice.png
Firefox 45
Based on Gecko 45
Currently in BETA channel
Moves to RELEASE week of March 8, 2016
Fxos-50slice.png.png
Firefox OS 1.4
Based on Gecko 45
Currently in BETA channel
Moves to RELEASE week of March 8, 2016
Thunderbird-50slice.png
Thunderbird 45
Based on Gecko 45
Currently in BETA channel
SM-50slice.png
SeaMonkey 2.42
Based on Gecko 45
Currently in BETA channel
Moves to RELEASE week of March 8, 2016

Based on Gecko 46

Aurora-50slice.png
Firefox 46
Based on Gecko 46
Currently in AURORA channel
Moves to BETA week of March 8, 2016
Earlybird-50slice.png
Thunderbird 46
Based on Gecko 46
Currently in EARLYBIRD channel
Moves to BETA week of March 8, 2016
SM-50slice.png
SeaMonkey 2.43
Based on Gecko 46
Currently in AURORA channel
Moves to BETA week of March 8, 2016

Based on Gecko 47

Nightly-50slice.png
Firefox 47
Based on Gecko 47
Currently in NIGHTLY channel
Moves to AURORA week of March 8, 2016
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 47
Based on Gecko 47
Currently in DAILY channel
Moves to EARLYBIRD week of March 8, 2016
SM-50slice.png
SeaMonkey 2.44
Based on Gecko 47
Currently in NIGHTLY channel
Moves to AURORA week of March 8, 2016

Previous Releases

2014

Release Date 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.