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FirefoxEnd of Life (EOL) Dates & Support Status

Active
ApplicationsLatest Version: 156.0.1Latest Release: Sep 22, 2026

Mozilla Firefox is a free, open-source web browser focused on privacy, performance, and user freedom.

Support summary

Firefox 140 reaches EOL in 2 days. Start upgrade planning and compatibility testing now.

What do EOL and support statuses mean?

Next EOL

Sep 29, 2026

Firefox 140 · 2 days left

Supported cycles

4

7 lts

Versions

57

Latest Version

156.0.1

Active Support

4

EOL

53

Lifecycle Timeline

Jan 13, 2026As of Sep 27, 2026
156Active · Date not announced
155EOL · Sep 15, 2026
154EOL · Sep 1, 2026
153Active · Date not announced
152EOL · Jul 21, 2026
151EOL · Jun 16, 2026
150EOL · May 18, 2026
149EOL · Apr 21, 2026
148EOL · Mar 24, 2026
147EOL · Feb 24, 2026
ActiveSecurityEOLHistorical phase unknown

Bars show history up to the snapshot date. Gray intervals lack dated support boundaries; arrows indicate an unannounced EOL date, not a support guarantee.

Versions

ReleaseRelease DateActive SupportEOLLatest VersionLTSStatus
156Sep 15, 2026MaintainedDate not announced156.0.1No
Active
155Sep 1, 2026EndedSep 15, 2026155.0.1No
EOL
154Aug 18, 2026EndedSep 1, 2026154.0.1No
EOL
153Jul 21, 2026MaintainedDate not announced153.3.0
Yes
Active
152Jun 16, 2026EndedJul 21, 2026152.0.6No
EOL
151May 18, 2026EndedJun 16, 2026151.0.4No
EOL
150Apr 21, 2026EndedMay 18, 2026150.0.3No
EOL
149Mar 24, 2026EndedApr 21, 2026149.0.2No
EOL
148Feb 24, 2026EndedMar 24, 2026148.0.2No
EOL
147Jan 13, 2026EndedFeb 24, 2026147.0.4No
EOL
146Dec 9, 2025EndedJan 13, 2026146.0.1No
EOL
145Nov 11, 2025EndedDec 9, 2025145.0.2No
EOL
144Oct 14, 2025EndedNov 11, 2025144.0.2No
EOL
143Sep 16, 2025EndedOct 14, 2025143.0.4No
EOL
142Aug 19, 2025EndedSep 16, 2025142.0.1No
EOL
141Jul 22, 2025EndedAug 19, 2025141.0.3No
EOL
140Jun 24, 2025MaintainedSep 29, 2026140.16.0
Yes
Active
139May 27, 2025EndedJun 24, 2025139.0.4No
EOL
138Apr 29, 2025EndedMay 27, 2025138.0.4No
EOL
137Apr 1, 2025EndedApr 29, 2025137.0.2No
EOL
136Mar 4, 2025EndedApr 1, 2025136.0.4No
EOL
135Feb 4, 2025EndedMar 4, 2025135.0.1No
EOL
134Jan 7, 2025EndedFeb 4, 2025134.0.2No
EOL
133Nov 26, 2024EndedJan 7, 2025133.0.3No
EOL
132Oct 29, 2024EndedNov 26, 2024132.0.2No
EOL
131Oct 1, 2024EndedOct 29, 2024131.0.3No
EOL
130Sep 3, 2024EndedOct 1, 2024130.0.1No
EOL
129Aug 6, 2024EndedSep 3, 2024129.0.2No
EOL
128Jul 9, 2024EndedSep 16, 2025128.14.0
Yes
EOL
127Jun 11, 2024EndedJul 9, 2024127.0.2No
EOL
126May 14, 2024EndedJun 11, 2024126.0.1No
EOL
125Apr 16, 2024EndedMay 14, 2024125.0.3No
EOL
124Mar 19, 2024EndedApr 16, 2024124.0.2No
EOL
123Feb 20, 2024EndedMar 19, 2024123.0.1No
EOL
122Jan 23, 2024EndedFeb 20, 2024122.0.1No
EOL
121Dec 19, 2023EndedJan 23, 2024121.0.1No
EOL
120Nov 21, 2023EndedDec 19, 2023120.0.1No
EOL
119Oct 24, 2023EndedNov 21, 2023119.0.1No
EOL
118Sep 26, 2023EndedOct 24, 2023118.0.2No
EOL
117Aug 29, 2023EndedSep 26, 2023117.0.1No
EOL
116Aug 1, 2023EndedAug 29, 2023116.0.3No
EOL
115Jul 4, 2023MaintainedMar 31, 2027115.38.0
Yes
Active
114Jun 6, 2023EndedJul 4, 2023114.0.2No
EOL
113May 9, 2023EndedJun 6, 2023113.0.2No
EOL
112Apr 11, 2023EndedMay 9, 2023112.0.2No
EOL
111Mar 14, 2023EndedApr 11, 2023111.0.1No
EOL
110Feb 14, 2023EndedMar 14, 2023110.0.1No
EOL
109Jan 17, 2023EndedFeb 14, 2023109.0.1No
EOL
108Dec 13, 2022EndedJan 17, 2023108.0.2No
EOL
107Nov 15, 2022EndedDec 13, 2022107.0.1No
EOL
106Oct 18, 2022EndedNov 15, 2022106.0.5No
EOL
105Sep 20, 2022EndedOct 18, 2022105.0.3No
EOL
104Aug 23, 2022EndedSep 20, 2022104.0.2No
EOL
103Jul 26, 2022EndedAug 23, 2022103.0.2No
EOL
102Jun 28, 2022EndedSep 26, 2023102.15.1
Yes
EOL
91Aug 10, 2021EndedSep 20, 202291.13.0
Yes
EOL
78Jun 30, 2020EndedNov 2, 202178.15.0
Yes
EOL

Data sources

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Frequently Asked Questions

Which versions of Firefox have reached end of life?
The following Firefox versions have reached end of life and no longer receive security updates: 155, 154, 152, 151, 150, 149, 148, 147 (and 45 more). It is recommended to upgrade to a supported version.
Is it safe to continue using Firefox 155?
Firefox 155 has reached end of life and no longer receives security patches or bug fixes. Continuing to use it may expose your systems to known vulnerabilities. We strongly recommend upgrading to a supported version.
What is the latest version of Firefox?
The latest version of Firefox is 156.0.1, released in the 156 release cycle.
How many versions of Firefox are currently supported?
Firefox currently has 4 actively supported version(s): 156, 153, 140, 115.
When does Firefox 156 reach end of life?
Firefox 156 does not have a specific end-of-life date announced yet.
What should I do when Firefox reaches end of life?
When a Firefox version reaches end of life, you should: 1) Plan your migration to a supported version as soon as possible. 2) Review the release notes for breaking changes. 3) Test your applications thoroughly in a staging environment. 4) Update your dependencies to ensure compatibility with the new version.