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Claude Opus 4.6 Uncovers 22 Firefox Vulnerabilities in Collaboration

3/10/2026

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Summary

Story summary

Anthropic's Claude Opus 4.6 identified 22 vulnerabilities in Mozilla Firefox during a two-week collaboration, including 14 high-severity issues and 112 reports.
The collaboration cost about $4,000 in API credits.
Most issues were addressed in Firefox version 148, released in January 2026.
The findings require human validation to manage false positives and assess real-world impact.

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Story summary

Anthropic's Claude Opus 4.6 identified 22 vulnerabilities in Mozilla Firefox during a two-week collaboration, including 14 high-severity issues and 112 reports.
The collaboration cost about $4,000 in API credits.
Most issues were addressed in Firefox version 148, released in January 2026.
The findings require human validation to manage false positives and assess real-world impact.