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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148.0b7 January 28, 2026 160 MB 148.0b5 January 23, 2026 160 MB 148.0b4 January 21, 2026 159 MB 148.0b3 January 18, 2026 159 MB 148.0b2 January 16, 2026 159 MB 147.0b9 January 02, 2026 155 MB