Download Firefox Developer Edition 140.0b4

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

Updated: June 04, 2025

Size: 144 MB

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144 MB · June 04, 2025

Firefox%20140.0b4.dmg

Previous versions More »

140.0b5 June 07, 2025 144 MB 140.0b4 June 04, 2025 144 MB 140.0b3 June 01, 2025 144 MB 140.0b2 May 30, 2025 143 MB 140.0b1 May 28, 2025 144 MB 139.0b10 May 19, 2025 142 MB