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

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141.0b4 July 02, 2025 144 MB 141.0b3 June 28, 2025 144 MB 141.0b2 June 27, 2025 144 MB 140.0b9 June 15, 2025 142 MB 140.0b8 June 13, 2025 143 MB 140.0b7 June 11, 2025 142 MB