# HailBrowser

> HailBrowser is the fastest browser use ever made: an open-source (MIT) browser agent for Chromium 116+ that drives the Chrome you are already signed into. Ultrafast passed 26 of 26 browser-use tasks at a 4.2s average across three full runs, with no false completions, and 16 of 16 tasks on live sites. It also brings browser use over MCP: a local server with 18 browser tools, so Claude Code, OpenCode, Cursor, Codex and other agents can drive the real, logged-in browser. And it is the open-source Comet alternative: an AI assistant for normal browser users, without switching browsers.

Key facts: version 0.1.0, MIT, no account, no telemetry, hub on `127.0.0.1:12306`, 20 tools (18 over MCP plus `run_task` and `stop_task`), Chrome/Edge/Brave 116+. Built by Shyamnath Sankar (https://shyamnathsankar.genrecai.com/) at GenrecAI (https://genrecai.com). Canonical site: https://hailbrowser.genrecai.com.

## Browser use and benchmarks

- [Browser use](https://hailbrowser.genrecai.com/browser-use): what browser use is, how the loop reads/acts/verifies, and how it compares with a Python browser-use library.
- [Browser use MCP](https://hailbrowser.genrecai.com/browser-mcp): the browser-use MCP server for Claude Code, OpenCode, Cursor and Codex: setup in one line, 18 tools, run_task ultrafast, agents get their own window.
- [Benchmark](https://hailbrowser.genrecai.com/benchmarks): 26 tasks at 4.2s average, 16 of 16 live sites (Wikipedia, GitHub, YouTube, MDN, forms) at 8.2s, every per-task time, the method and the caveats.
- [Open-source Comet alternative](https://hailbrowser.genrecai.com/comet-alternative): the AI-browser idea as an extension for your existing Chrome, plus MCP for coding agents.
- [About](https://hailbrowser.genrecai.com/about): who builds it, the principles, the stack and the licence.

## Docs

- [Install](https://hailbrowser.genrecai.com/docs/install): clone, load the `extension/` folder unpacked, add a model key, verify the side panel.
- [Connect an agent](https://hailbrowser.genrecai.com/docs/connect): config blocks for Claude Code, OpenCode, Cursor, Codex CLI, Claude Desktop, Windsurf and Gemini CLI.
- [MCP reference](https://hailbrowser.genrecai.com/docs/mcp): all twenty tools with parameters, return shapes and failures.
- [Modes](https://hailbrowser.genrecai.com/docs/modes): Chat, Fast (ultrafast), Research and Tasks, with honest cost shapes.
- [Security](https://hailbrowser.genrecai.com/docs/security): keys in `chrome.storage.local`, loopback-only hub, the trusted extension file, prompt-injection stance, and the gaps.
- [Limits](https://hailbrowser.genrecai.com/docs/limits): shadow DOM, cross-origin iframes, canvas, uploads, PDF research, Chrome pages, unattended schedules.
- [FAQ](https://hailbrowser.genrecai.com/faq): the questions asked before installing.

## Use cases

- [Coding agents](https://hailbrowser.genrecai.com/use-cases/coding-agents): let Claude Code, Cursor, Codex or OpenCode use your logged-in browser over MCP.
- [Web research](https://hailbrowser.genrecai.com/use-cases/web-research): an answer-first report with numbered citations, read in background tabs of your browser.
- [Recurring jobs](https://hailbrowser.genrecai.com/use-cases/recurring-jobs): once, daily, weekdays or every few hours, with stricter rules for unattended runs.
- [Form flows](https://hailbrowser.genrecai.com/use-cases/form-flows): pass the goal and values; the decision model picks one operation and one element per step.

## Source

- [Repository](https://github.com/Shyamnath-Sankar/project-hailbrowser): the extension, MCP server, tests, benchmark harness and docs.
- [Support](https://hailbrowser.genrecai.com/support): issues, security reports and what to include.