Download Firefox Developer Edition 147.0b9

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

Updated: January 02, 2026

Size: 155 MB

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155 MB · January 02, 2026

Firefox%20147.0b9.dmg

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147.0b9 January 02, 2026 155 MB 147.0b8 December 31, 2025 155 MB 147.0b7 December 24, 2025 155 MB 147.0b6 December 21, 2025 156 MB 147.0b5 December 19, 2025 156 MB 147.0b4 December 17, 2025 156 MB