Claude-powered harness helped Mozilla squash a 15-year-old Firefox bug in record month
Brian Grinstead’s team ran an agentic bug-finding pipeline that paired Claude Mythos with a simple goal-loop harness, scanning Firefox’s massive codebase and surfacing 423 patches in one month, including a 15-year-old vulnerability. He argues the harness and verification steps contributed as much as the LLM, offering a reproducible playbook for any team.