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Release information

Firefox 149.0
Based on Gecko 149

Released on 2026-03-24

Thunderbird 149.0.1
Based on Gecko 149.0.1

Released on 2026-03-26

All Releases

Firefox Release Management pointers

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

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Firefox Docs

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• Discover new ways to contribute

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• Mozilla Community Participation Guidelines (CPG)
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