Main Page

Release information

Firefox 143.0.1
Based on Gecko 142

Released on 2025-09-19

Thunderbird 143.0
Based on Gecko 143.0

Released on 2025-09-16

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

How to use this wiki

• Mozilla Community Participation Guidelines (CPG)
• About MozillaWiki
• Tips and tricks for MozillaWiki

Looking for the old Main Page?