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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147.0b3 December 14, 2025 156 MB 147.0b2 December 12, 2025 156 MB 147.0b1 December 10, 2025 156 MB 146.0b9 November 30, 2025 154 MB 146.0b8 November 28, 2025 154 MB 146.0b7 November 26, 2025 154 MB