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Firefox release notes, bug-fix rollups, and Mozilla's AI-assisted security pipeline.

Related: #mozilla · 2 #ai-security · 1 #anthropic · 1 #browsers · 1 #claude-mythos · 1 #google · 1 #project-glasswing · 1 #rust · 1 #security · 1 #web · 1
The same photo of a curled-up red fox shown in four vertical slices, blurry at 4% downloaded and sharp at 100%, demonstrating JPEG XL progressive rendering
Web·

Mozilla made Google rewrite the JPEG XL decoder in Rust before Firefox would ship it

Firefox turns JPEG XL on by default in version 157. Mozilla refused to ship 100,000 lines of C++, so Google Research wrote the decoder again in Rust.

Mozilla Firefox 150 security announcement cover graphic
Open Source·

Mozilla fixed 271 Firefox bugs that Claude Mythos found. Its own tests caught 22.

Firefox 150 shipped Monday with 271 security fixes from Anthropic's Project Glasswing. Mozilla CTO Bobby Holley says Mythos matches elite human researchers.