Anthropic partnered with Mozilla to run its Claude Opus 4.6 AI on Firefox’s codebase for two weeks. The effort uncovered 22 separate vulnerabilities, including 14 classified as high‑severity. Most bugs were patched in Firefox 148, while a few remain for the next release. The AI proved better at identifying flaws than creating exploit code, with only two proof‑of‑concept exploits produced after spending $4,000 in API credits. The findings highlight the power of AI tools for open‑source security reviews, even as they generate a mix of useful and noisy contributions. Read more →