Firefox Developer Edition

139.0b8

Mozilla

Dev Onboard

4 reviews

186.9 k downloads

A special version of Firefox for developers

Older versions of Firefox Developer Edition

Newer versions of Firefox Developer Edition may sometimes fail to install on older devices. Also, new updates may not be fully compatible with some Windows architectures. While the developer fixes the problem, try using an older version of Firefox Developer Edition. Previous versions of Firefox Developer Edition can be found in Uptodown's version history, where the app's available files are stored. Safely download previous versions of Firefox Developer Edition for Windows.

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exe 139.0b8 May 16, 2025

exe 139.0b5 May 9, 2025

exe 139.0b4 May 7, 2025

exe 138.0b9 Apr 23, 2025

exe 138.0b8 Apr 18, 2025

exe 138.0b7 Apr 16, 2025

exe 138.0b4 Apr 9, 2025

exe 138.0b1 Apr 2, 2025

exe 137.0b10 Mar 26, 2025

exe 137.0b7 Mar 19, 2025

exe 137.0b4 Mar 12, 2025

exe 137.0b1 Mar 4, 2025

exe 136.0b7 Feb 19, 2025

exe 136.0b4 Feb 12, 2025

exe 136.0b1 Feb 5, 2025

exe 135.0b9 Jan 29, 2025

exe 135.0b7 Jan 22, 2025

exe 135.0b3 Jan 15, 2025

exe 135.0b1 Jan 8, 2025

exe 134.0b8 Dec 11, 2024