Hardening Firefox with Anthropic’s Red Team | The Mozilla Blog

A brief reminder of the power each of us hold and how their is a positive side to the Internet through all these shiny new little bits.

Claude Opus 4.6 discovered 22 Firefox vulnerabilities in two weeks, including 14 high-severity bugs, as nearly 20% of all critical Firefox vulnerabilities were fixed in 2025. The AI also wrote working exploits for two bugs, demonstrating emerging capabilities that give defenders a temporary advantage but signal an accelerating arms race in cybersecurity.

A curated roundup of JavaScript ecosystem news: TypeScript, Node.js, Deno, AI developer tools, security discoveries, and new libraries from the past two weeks.

Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

New details about what we found, and how agentic harnesses are now able to reproduce real bugs and dismiss false positives.

I was a guest on Lenny Rachitsky’s podcast, in a new episode titled An AI state of the union: We’ve passed the inflection point, dark factories are coming, and automation …

Multiple things can be true at the same time

Table of Contents Intro Lore Why "Find All The Vulnerabilities" does not work Minimal Scaffolding That Actually Helps Case Study: Claude Opus 4...

New details about what we found, and how agentic harnesses are now able to reproduce real bugs and dismiss false positives.

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CTO says new AI model is "every bit as capable" as world's best security researchers.

Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

New details about what we found, and how agentic harnesses are now able to reproduce real bugs and dismiss false positives.