Releases
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Current Releases
Standard support
Based on Gecko 147
Firefox 147.0.3
Based on Gecko 147
Based on Gecko 147
Released on 2026-02-03
SeaMonkey 2.144
Based on Gecko 147
Based on Gecko 147
Released on 2014-12-04
Based on Gecko 31
Thunderbird 60.87.0
Based on Gecko 60
Based on Gecko 60
Released on 2026-02-03
Based on Gecko 28
Firefox OS 1.3
Based on Gecko 28
Based on Gecko 28
Released on 2014-03-17
Extended support
Based on Gecko 60
Firefox 60.87.0esr
Based on Gecko 60
Based on Gecko 60
Released on 2026-01-13
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 148
Firefox 148
Based on Gecko 148
Based on Gecko 148
Currently in BETA channel
Moves to RELEASE week of February 24, 2026
Moves to RELEASE week of February 24, 2026
Thunderbird 148
Based on Gecko 148
Based on Gecko 148
Currently in BETA channel
SeaMonkey 2.145
Based on Gecko 148
Based on Gecko 148
Currently in BETA channel
Moves to RELEASE week of February 24, 2026
Moves to RELEASE week of February 24, 2026
Based on Gecko 54
Firefox 54
Based on Gecko 54
Based on Gecko 54
Currently in AURORA channel
Moves to BETA week of February 24, 2026
Moves to BETA week of February 24, 2026
Thunderbird 54
Based on Gecko 54
Based on Gecko 54
Currently in EARLYBIRD channel
Moves to BETA week of February 24, 2026
Moves to BETA week of February 24, 2026
SeaMonkey 2.51
Based on Gecko 54
Based on Gecko 54
Currently in AURORA channel
Moves to BETA week of February 24, 2026
Moves to BETA week of February 24, 2026
Based on Gecko 149
Firefox 149
Based on Gecko 149
Based on Gecko 149
Currently in NIGHTLY channel
Moves to BETA week of February 24, 2026
Moves to BETA week of February 24, 2026
Thunderbird 149
Based on Gecko 149
Based on Gecko 149
Currently in DAILY channel
Moves to BETA week of February 24, 2026
Moves to BETA week of February 24, 2026
SeaMonkey 2.146
Based on Gecko 149
Based on Gecko 149
Currently in NIGHTLY channel
Moves to AURORA week of February 24, 2026
Moves to AURORA week of February 24, 2026
B2G Releases
Firefox OS 1.4
Based on Gecko 30
Based on Gecko 30
Released on ??
Firefox OS 2.0
Based on Gecko 32
Based on Gecko 32
Currently in BETA channel
Moves to RELEASE week of ??
Moves to RELEASE week of ??
Firefox OS 2.1
Based on Gecko 34
Based on Gecko 34
Currently in AURORA channel
Moves to BETA week of ??
Moves to BETA week of ??
Firefox OS 2.2
Based on Gecko 37
Based on Gecko 37
Currently in NIGHTLY channel
Moves to AURORA week of ??
Moves to AURORA week of ??
Previous Releases
2014
| Release | Date | Notes |
|---|---|---|
| SeaMonkey 2.31 | December 9 | Release Notes |
| Thunderbird 31.3.0 | December 1 | Release Notes |
| Firefox 33.1 | November 10 | Release Notes |
| Firefox 33.0.3 | November 6 | Release Notes |
| Firefox 33.0.2 | October 28 | Release Notes |
| Firefox 33.0.1 | October 24 | Release Notes |
| SeaMonkey 2.30 | October 15 | Release Notes |
| Thunderbird 31.2.0 | October 14 | Release Notes |
| Firefox 33.0 | October 14 | Release Notes |
| Firefox 31.1.1esr | September 24 | Release Notes |
| Firefox 24.8.1esr | September 24 | Release Notes |
| Firefox 32.0.3 | September 24 | Release Notes |
| Thunderbird 31.1.2 | September 24 | Release Notes |
| SeaMonkey 2.29.1 | September 24 | Release Notes |
| Firefox 32.0.2 | September 18 | Release Notes |
| Firefox 32.0.1 | September 12 | Release Notes |
| Thunderbird 31.1.1 | September 9 | Release Notes |
| SeaMonkey 2.29 | September 7 | Release Notes |
| Firefox 32.0 | September 2 | Release Notes |
| Thunderbird 31.1.0 | September 2 | Release Notes |
| Thunderbird 24.8.0 | September 2 | Release Notes |
| Firefox 31.0 | July 22 | Release Notes |
| Thunderbird 31.0 | July 22 | Release Notes |
| Thunderbird 24.7.0 | July 22 | Release Notes |
| SeaMonkey 2.26.1 | June 16 | Release Notes |
| Thunderbird 24.6.0 | June 10 | Release Notes |
| Firefox 30.0 | June 10 | Release Notes |
| Firefox 24.6.0esr | June 10 | Release Notes |
| Firefox 30.0 for Android | June 10 | Release Notes |
| Firefox 29.0.1 | May 9 | Release Notes |
| Firefox 29.0.1 for Android | May 9 | Release Notes |
| SeaMonkey 2.26 | May 2 | Release Notes |
| Thunderbird 24.5.0 | April 29 | 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.
- perhaps you'd like to see who release drivers for various releases are?
- or perhaps you'd like to learn more about the priority rankings we assign to releases?
- you might even wonder how we use flags to manage our releases?
- or what branches exist and when they branched?
- perchance you're confused about update terminology?
- maybe you'd like to know about our various branch support levels?
- perhaps you want to see the RapidRelease Calendar for future aurora merges, beta merges, and releases?
- maybe you are interested in checking the Feature Release Tracker for upcoming features?