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7 May 202620 Dhuʻl-Qiʻdah 1447 AH
Behind the Scenes Hardening Firefox with Claude Mythos Preview

Behind the Scenes Hardening Firefox with Claude Mythos Preview

Mozilla utilized the Claude Mythos model to identify and fix hundreds of vulnerabilities in Firefox. In April 2026, the number of fixed bugs surged to 423, compared to the previous rate of 20-30 per month. This improvement is attributed to enhanced model capabilities and better techniques for leveraging them. The vulnerabilities addressed included a 20-year-old XSLT bug and a 15-year-old issue in the <legend> element. Existing defense mechanisms in Firefox successfully blocked many attempts, demonstrating the effectiveness of current security measures.

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