Download Firefox Developer Edition 140.0b5

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

Updated: June 07, 2025

Size: 144 MB

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144 MB · June 07, 2025

Firefox%20140.0b4.dmg

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141.0b5 July 04, 2025 144 MB 141.0b4 July 02, 2025 144 MB 141.0b3 June 28, 2025 144 MB 141.0b2 June 27, 2025 144 MB 140.0b9 June 15, 2025 142 MB 140.0b8 June 13, 2025 143 MB