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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148.0b15 February 15, 2026 158 MB 148.0b14 February 13, 2026 158 MB 148.0b13 February 11, 2026 158 MB 148.0b12 February 08, 2026 158 MB 148.0b11 February 06, 2026 158 MB 148.0b10 February 03, 2026 158 MB