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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144.0b9 October 05, 2025 151 MB 144.0b8 October 03, 2025 151 MB 144.0b7 October 01, 2025 151 MB 144.0b6 September 28, 2025 152 MB 144.0b5 September 26, 2025 152 MB 144.0b4 September 24, 2025 152 MB