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Mozilla and Firefox: browser releases, security work, and foundation decisions.

Related: #browsers · 2 #firefox · 2 #rust · 2 #web-standards · 2 #ai-security · 1 #anthropic · 1 #claude-mythos · 1 #google · 1 #open-source · 1 #project-glasswing · 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.

GitHub release card for servo/servo version 0.4.0, showing the multicolour Servo hexagon logo and a note pointing to the project's June blog post
Open Source·

65.9% of the web platform tests now pass in Servo, but the Rust engine can't select text

Servo 0.4.0 landed a record 558 commits and fixed layout on real sites. Its own dashboard reads 65.9%, CSS Grid sits at 37.8%, and text selection isn't shipped yet.

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.