Download Firefox Developer Edition 129.0b3

Get the latest features, fast performance, and the development tools!

Updated: July 14, 2024

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· July 14, 2024

Firefox%20129.0b3.dmg

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145.0b9 November 03, 2025 152 MB 145.0b8 October 31, 2025 152 MB 145.0b7 October 29, 2025 152 MB 145.0b6 October 26, 2025 154 MB 145.0b5 October 24, 2025 153 MB 145.0b4 October 22, 2025 154 MB