Mozilla Uses Claude to Identify 271 Security Vulnerabilities in Firefox 150

Summary

Mozilla's ongoing collaboration with Anthropic has yielded a significant security milestone: an early version of Claude Mythos Preview was applied to the Firefox codebase, resulting in the identification of 271 vulnerabilities that are patched in this week's release of Firefox 150. The findings were disclosed via Mozilla's official security advisories (MFSA-2026-30), and Bobby Holley of Mozilla characterized the experience as encouraging for engineering teams willing to integrate AI-driven secur