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Firefox 150 Patches 271 Bugs Found by Claude Mythos

By SkimNews · Summarized & edited by · 2026-04-26
Firefox 150 Patches 271 Bugs Found by Claude Mythos

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Firefox 150 ships with fixes for 271 security vulnerabilities uncovered by an early version of Anthropic's Claude Mythos Preview, as Mozilla declares AI has tipped the balance from offense to defense in browser security.

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Why it matters: Holley explicitly claims the era of offense-dominant security is ending, a direct rebuttal to the long-standing industry assumption that defenders can only hope to make exploits prohibitively expensive. The 271-bug haul — versus 22 from the prior Opus 4.6 scan — demonstrates that AI vulnerability discovery is scaling far faster than patching throughput, meaning every browser and OS vendor faces a similar reckoning in the near term.

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