As AI accelerates both attacks and defenses, Mozilla will continue investing in the tools, processes, and partnerships that ensure Firefox keeps getting stronger.

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Anthropic's Frontier Red Team used Claude to perform AI-assisted vulnerability detection on Firefox's codebase, discovering 14 high-severity bugs and issuing 22 CVEs, all of which have been fixed in Firefox 148. The team also found 90 additional lower-severity bugs. Unlike typical AI bug reports, each submission included minimal reproducible test cases, enabling Mozilla engineers to verify and fix issues quickly. The collaboration highlights AI-assisted analysis as a powerful new security tool, capable of uncovering logic errors that traditional fuzzing missed. Mozilla is now integrating similar AI-assisted analysis into its internal security workflows.

Hardening Firefox with Anthropic’s Red Team

An emerging technique, pressure-tested by Firefox engineers