Download Firefox Developer Edition 148.0b12

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

Updated: February 08, 2026

Size: 158 MB

Download

158 MB · February 08, 2026

Firefox%20148.0b12.dmg

Previous versions More »

148.0b15 February 15, 2026 158 MB 148.0b14 February 13, 2026 158 MB 148.0b13 February 11, 2026 158 MB 148.0b12 February 08, 2026 158 MB 148.0b11 February 06, 2026 158 MB 148.0b10 February 03, 2026 158 MB