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Release information

Firefox 147.0.1
Based on Gecko 147

Released on 2026-01-16

Thunderbird 147.0
Based on Gecko 147.0

Released on 2026-01-13

All Releases

Firefox Release Management pointers

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

Support for users

Support for developers

Firefox Docs

Contributing to Mozilla

• Mozilla project-wide status meetings (every Monday)
• Other project calls
• Mozilla projects (Firefox, Platform, Add-ons, etc.)
• Student Ambassadors
• Why contribute to Mozilla?
• Discover new ways to contribute

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• Mozilla Community Participation Guidelines (CPG)
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