Mozilla's Firefox team collaborated with Anthropic's red team using Claude Opus 4.6 to find security vulnerabilities in the browser codebase. The AI-assisted effort discovered 14 high-severity bugs and resulted in 22 CVEs, all now patched. Claude even generated a working exploit for one vulnerability in a controlled test environment, though it cannot yet produce full-chain sandbox-escaping exploits. Separately, Mozilla engineer Gabriele Svelto found that roughly 10–15% of Firefox crashes stem from hardware bit flips caused by faulty memory components, a problem outside Mozilla's control.
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