#mozilla

Anthropic said Claude Opus 4.6 found 22 Firefox vulnerabilities during a two-week collaboration with Mozilla. Mozilla classified 14 as high severity and shipped fixes in Firefox 148.0.

Anthropic said on March 6, 2026 that Claude Opus 4.6 uncovered 22 Firefox vulnerabilities in two weeks, including 14 high-severity issues, during a collaboration with Mozilla. The accompanying write-up argues that frontier models are becoming materially useful for real vulnerability discovery, not just benchmark performance.

Mozilla Firefox 148 debuts an 'AI Kill Switch' that lets users permanently disable all AI features in the browser, with the setting persisting across future updates. The release also includes new web security APIs and accessibility improvements.