Nanobrowser (13,530 Stars) 2026: The Open-Source Chrome Extension for AI-Powered Web Research

Nanobrowser (13,530 stars) is the open-source Chrome extension that turns your browser into an AI research agent - local-first, model-agnostic and private. Here is the guide.

💡 What You Will Learn

Nanobrowser (13,530 stars) is the open-source Chrome extension that turns your browser into an AI research agent - local-first, model-agnostic and private. Here is the guide.

## The short answer **nanobrowser/nanobrowser** (13,530 stars, TypeScript) is an open-source Chrome extension that gives you an AI-powered web research assistant. It lets AI agents browse pages, read content, and answer questions about what they found - with local-first design: you bring your own API key or local model, and your data stays in your browser. ## Why it stands out - **AI in your browser**: research without leaving the tab - **Local-first**: keys stored locally; supports local models via Ollama - **Model-agnostic**: OpenAI, Anthropic, Gemini, and local endpoints - **Privacy-friendly**: no cloud relay - your browsing stays yours - **Open source**: auditable code (MIT) ## Installation 1. Get it from the Chrome Web Store or build from source (`npm install && npm run build`). 2. Open the extension, go to settings, and add your API key (or a local Ollama endpoint). 3. Start a research session: give it a task like "research the top 5 open-source vector databases and compare them". 4. The agent browses pages, extracts content, and summarizes findings in the side panel. ## Using it for research workflows - Ask multi-step questions - it can open several pages and synthesize answers. - Use it alongside your normal browsing: highlight and ask for explanations. - Configure which model handles which task (browsing vs summarization). ## Practical tips - For heavy research, use a capable cloud model; for privacy-sensitive topics, switch to a local model. - Review sources it cites - the extension shows the pages it visited. - Clear session history regularly to keep the context window clean. ## FAQ **Is it free?** Yes - MIT licensed open source. **Does it collect my data?** No - it is local-first; you control keys and no server relay is involved. **Does it support Firefox?** It is built for Chromium browsers (Chrome, Edge, Brave).