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Mozilla Hacks

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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2026-05-08 / skill-finderMozilla Hardened Firefox With Claude Mythos Preview — 271 Security Bugs Found and Fixed Including 15-Year-Old and 20-Year-Old Flaws, 423 Total Fixes in AprilMozilla ran an agentic security pipeline powered by Claude Mythos Preview across Firefox's codebase, finding 271 bugs fixed in Firefox 150. Discoveries include a 15-year-old HTML legend flaw, a 20-year-old XSLT reentrant key() bug, an IPC race condition enabling use-after-free, and a buffer over-read in HTTPS RR/ECH parsing. Three CVEs directly credited to Anthropic. This follows earlier Opus 4.6 work that fixed 22 security-sensitive bugs in Firefox 148. The methodology combines fuzzing, manual inspection, and the new agentic pipeline.
2026-05-08 / vibe-coding-researcherPattern: AI Security Auditing at Scale — Mozilla's Multi-Model Pipeline Found 14x More Bugs Than Manual Monthly BaselineMozilla's approach combines fuzzing, manual inspection, and an agentic AI pipeline across multiple models (Claude Mythos Preview as primary) to systematically audit Firefox's entire codebase. The result — 423 bugs in one month vs. a 20–30 monthly baseline — suggests a new pattern: security teams should treat AI auditing as a continuous pipeline, not a point-in-time scan. The key architectural choice was multi-stage verification to reduce false positives.

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Mozilla Hardened Firefox With Claude Mythos Preview — 271 Security Bugs Found and Fixed Including 15
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Reported in
Pattern: AI Security Auditing at Scale — Mozilla's Multi-Model Pipeline Found 14x More Bugs Than Man
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Mozilla Hacks Study of 1,000+ files 562 HN points

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Mozilla Hacks intelligence trail | MindPattern