Download Firefox Developer Edition 145.0b9

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

Updated: November 03, 2025

Size: 152 MB

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152 MB · November 03, 2025

Firefox%20145.0b9.dmg

Previous versions More »

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