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.

📜 Table of Contents

• The short answer
• Why it stands out
• Installation
• Using it for research workflows
• Practical tips
• FAQ

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).

❓ 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).