Download Firefox Developer Edition 146.0b1

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

Updated: November 12, 2025

Size: 155 MB

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155 MB · November 12, 2025

Firefox%20146.0b1.dmg

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146.0b5 November 21, 2025 155 MB 146.0b4 November 19, 2025 155 MB 146.0b3 November 16, 2025 155 MB 146.0b2 November 14, 2025 155 MB 146.0b1 November 12, 2025 155 MB 145.0b9 November 03, 2025 152 MB