firefox

A patch for Firefox to work around a crash on Intel Raptor Lake CPUs, authored by glandium.

Mozilla announces Project Nova, a redesign of Firefox focusing on privacy, speed, and a cleaner, warmer design, with updates to tabs, settings, and compact mode.

Firefox now supports Web Serial for direct communication with Adafruit hardware boards, eliminating the need for separate desktop tools and simplifying the development process.

Mozilla announces Project Nova, a major visual overhaul of Firefox with rounded UI, improved privacy controls including a toggle to disable all AI features, and new customization options. The redesign will roll out later this year.

Firefox 151 adds support for the Web Serial API, enabling web applications to directly communicate with serial devices like microcontrollers, 3D printers, and development boards without native software, expanding its utility for hardware hacking and education.

Mozilla's SpiderMonkey engine disables asm.js optimizations by default, marking the end of the technology that paved the way for WebAssembly. Users are encouraged to recompile to WebAssembly for better performance.

Browsers like Safari and Firefox ship domain-specific code to fix compatibility issues with major websites, while Chrome does not, revealing how browser engines handle web quirks.

Powered by Claude Mythos Preview, the Firefox team fixed more security vulnerabilities in April than in the past 15 months combined, demonstrating AI's significant role in boosting the efficiency of software security maintenance.

The author releases StealthFox, an open-source Firefox fork designed to bypass anti-bot systems by generating unique, consistent browser fingerprints at the C++ level for AI web agents.

Mozilla reports a significant increase in security fixes for Firefox in April after utilizing Claude Mythos to assist in bug hunting and hardening the browser.

Mozilla used the Claude Mythos preview to systematically find and fix hundreds of security vulnerabilities in Firefox, dramatically increasing their bug-fix rate from around 20-30 per month to 423 in April 2026.

Mozilla details how they used Claude Mythos Preview and other AI models to identify and fix a significant number of latent security bugs in Firefox, demonstrating a shift in the efficacy of AI for code hardening.

A Firefox IndexedDB ordering bug lets any site generate a stable cross-origin identifier that persists even through Tor Browser’s “New Identity” reset; Mozilla has patched Firefox 150 and ESR 140.10.

Firefox 150 shipped with 271 security fixes found by Anthropic’s Claude Mythos Preview, marking a major AI-driven win for defensive security.

Mozilla used Anthropic’s Mythos Preview to automatically identify and fix 271 vulnerabilities in Firefox 150, signaling a major shift in how software security will be managed as AI-powered bug discovery becomes widespread.

Mozilla used Anthropic's Claude Mythos Preview AI to find and fix 271 zero-day vulnerabilities in Firefox 150, marking a major shift in cybersecurity where AI enables defenders to decisively outpace attackers.