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Release information

Firefox 139.0.1
Based on Gecko 139

Released on 2025-05-29

Thunderbird 128.11.0esr
Based on Gecko 128.11.0esr

Released on 2025-05-27

All Releases

Firefox Release Management pointers

• Release calendar
• Release process overview
• Release owners
• More about release management…

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Contributing to Mozilla

• Mozilla project-wide status meetings (every Monday)
• Other project calls
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• Why contribute to Mozilla?
• Discover new ways to contribute

How to use this wiki

• Mozilla Community Participation Guidelines (CPG)
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