271 bugs found in Firefox, zero written by a human attacker. What this means for the future of safe code + 2 prompts
Mozilla’s Mythos experiment reads, at first, like a cybersecurity story. Anthropic built Mythos for vulnerability research. Mozilla pointed it at Firefox. The previous AI scan, run with a general-purpose model, surfaced 22 security-sensitive bugs. One release cycle later, with the purpose-built model, the number was 271. The Firefox security team — a group that has spent two decades being skeptical about new tools — published the result with the kind of careful enthusiasm that means something has actually changed.
