Download Firefox Developer Edition 147.0b4

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

Updated: December 17, 2025

Size: 156 MB

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156 MB · December 17, 2025

Firefox%20147.0b4.dmg

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147.0b5 December 19, 2025 156 MB 147.0b4 December 17, 2025 156 MB 147.0b3 December 14, 2025 156 MB 147.0b2 December 12, 2025 156 MB 147.0b1 December 10, 2025 156 MB 146.0b9 November 30, 2025 154 MB