I Built a Browser Extension That Catches Your Secrets Before AI Does

We all do it. Copy a chunk of code, paste it into ChatGPT, ask "why doesn't this work?" — and accidentally send your AWS keys, database credentials, or a client's email along with it. I did it once. I pasted a config file into Claude and realized — three seconds too late — that it contained a production database connection string. Nothing bad happened. But that "oh no" feeling stuck with me. So I built Nolex — a Chrome extension that sits between your clipboard and AI platforms, scanning everything you upload or paste for sensitive data. If it finds something, it shows you exactly what and lets you redact it before sending. The key part: everything runs locally in your browser . No servers, no cloud, no telemetry. Your data never leaves your machine. The Problem Is Bigger Than You Think Every day, millions of developers paste code snippets, configs, logs, and documents into AI chatbots. Most of the time it's fine. But sometimes that snippet contains: An sk-proj-... OpenAI API key AWS c