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Behind the Scenes Hardening Firefox with Claude Mythos Preview – Mozilla Hacks - the Web developer blog

hacks.mozilla.org

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

39 pages link to this URL
Everything That Happened in AI This Weekend May 9-10

The Trump administration drafted an AI security order that omits mandatory model tests; Apple and Intel reached a Trump-pushed preliminary chip-making agreement; French prosecutors escalated their Musk and X probe to a criminal investigation; the US suspects a Thai national-AI partner helped smuggle Nvidia chips to Alibaba; Cerebras is set to raise its IPO range on 20× oversubscription.

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Adële 🐁! (@adele@social.pollux.casa)

aka 아델 #French 🇫🇷 #PHP / #JavaScript and #Java developer #Korean 🇰🇷 ancestry (but I don’t speak the language) Into #SmolWeb, #GeminiProtocol, #Smolnet, #LowTech #ArchLinux / #Debian user #Markdown 🇲⬇️ enthusiast Instance running #GoToSocial 🦥 en / fr :straightally:

1 inbound link profile en
Weeknote, Sunday 10th May

A week off work – much needed. Lots of tinkering, house chores and downtime. Also stumbled on two cracking Post Box toppers, one celebrating Star Wars day! Found these on my daily walks, now …

0 inbound links article en Weeknotes
Cyber Lack of Security and AI Governance

The real recent story of AI has been the background work being done on Cybersecurity, as we process the Mythos Moment along with GPT-5.5, and figure out both how to patch the internet and what our …

0 inbound links article en Uncategorized aiartificial-intelligencechatgptcybersecuritytechnology
Weekly Notes 20/2026

We are in Thrissur. We left at around 2 AM and reached by 11 AM, with two breaks. The drive was comfortable. The traffic was friendly this time. Echo is getting old, and Uma is more active now. So …

1 inbound link article en
Cyber Lack of Security and AI Governance

The real recent story of AI has been the background work being done on Cybersecurity, as we process the Mythos Moment along with GPT-5.5, and figure out both how to patch the internet and what our new regulatory regime is going to look like.

0 inbound links article en
Simon Willison on ai-security-research

17 posts tagged ‘ai-security-research’. Using AI tools to help find security vulnerabilities.

0 inbound links website en ai 2016generative-ai 1785llms 1751security 602anthropic 282ai-ethics 301claude 275thomas-ptacek 18openai 418open-source 303
Simon Willison on security

602 posts tagged ‘security’.

0 inbound links website en ai 2016llms 1751generative-ai 1785prompt-injection 147xss 60exfiltration-attacks 43javascript 755csrf 54phishing 54python 1250
Simon Willison on llms

1,751 posts tagged ‘llms’. Large Language Models (LLMs) are the class of technology behind generative text AI systems like OpenAI's ChatGPT, Google's Gemini and Anthropic's Claude.

0 inbound links website en ChatGPTGeminiClaudeai 2016generative-ai 1785openai 418ai-assisted-programming 381anthropic 282claude 275llm 598ai-ethics 301llm-release 199coding-agents 201
Simon Willison on ai

2,016 posts tagged ‘ai’. "AI is whatever hasn't been done yet"—Larry Tesler

0 inbound links website en generative-ai 1785llms 1751openai 418ai-assisted-programming 381ai-ethics 301anthropic 282claude 275llm 598llm-release 199coding-agents 201
Simon Willison on generative-ai

1,785 posts tagged ‘generative-ai’. Machine learning systems that can generate new content: text, images, audio, video and more.

0 inbound links website en ai 2016llms 1751openai 418ai-assisted-programming 381ai-ethics 301anthropic 282claude 275llm 598llm-release 199coding-agents 201
AI and software security: the slop is now signal

No matter how you feel about AI, it’s changing the world of software. The “T” in ChatGPT was invented to improve language translation, and large language models (LLMs) are very good at this. Interestingly, translating between French and Japanese is effectively the same as translating between English and Python for these systems. As LLMs improve, we’re also finding that there’s little difference between “help me fix mistakes in this document”, and “find the flaws in this codebase”. LLMs are now great at both tasks, but the latter has much larger implications.

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Behind the Scenes Hardening Firefox with Claude Mythos Preview

Fascinating, in-depth details on how Mozilla used their access to the Claude Mythos preview to locate and then fix hundreds of vulnerabilities in Firefox: Suddenly, the bugs are very good …

0 inbound links article en firefox 101mozilla 116security 602ai 2016generative-ai 1785llms 1751anthropic 282claude 275ai-security-research 17