Mozilla touts Mythos AI for surfacing 271 Firefox flaws with minimal false positives

Mozilla says Mythos, guided by a custom harness, identified 271 Firefox vulnerabilities in two months with 'almost no false positives,' using the same testing pipeline as human developers. Of these, 180 were sec-high, 80 sec-moderate, and 11 sec-low; 12 Bugzilla reports have been released so far. Critics question cherry-picking and CVE designations, but Mozilla argues the harness plus a second LLM verifier makes AI-assisted discovery scalable and reliable, not marketing.