Download Firefox Developer Edition 142.0b1

Get the latest features, fast performance, and the development tools!

Updated: July 23, 2025

Size: 149 MB

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149 MB · July 23, 2025

Firefox%20142.0b1.dmg

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142.0b2 July 24, 2025 149 MB 142.0b1 July 23, 2025 149 MB 141.0b9 July 13, 2025 147 MB 141.0b8 July 11, 2025 147 MB 141.0b7 July 09, 2025 148 MB 141.0b6 July 06, 2025 149 MB