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Firefox: 271 Vulnerabilities Found via AI-Assisted Discovery

Firefox: 271 Vulnerabilities Found via AI-Assisted Discovery

ATLAS OWASP MEDIUM Moderate risk · Monitor closely ▲ 7.2 Simon Willison

Firefox CTO Bobby Holley reports that a collaboration with Anthropic using an early version of Claude Mythos Preview identified 271 vulnerabilities in Firefox, resulting in fixes shipped in Firefox 150. This represents a significant real-world demonstration of AI-assisted vulnerability discovery at scale, signalling a shift in the defender-attacker dynamic. The findings suggest LLMs are becoming operationally viable tools for large-scale code security auditing.

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