Skillget

open-claude-in-chrome

mcp
Guvenlik Denetimi
Basarisiz
Health Uyari
  • No license — Repository has no license file
  • Description — Repository has a description
  • Active repo — Last push 0 days ago
  • Low visibility — Only 5 GitHub stars
Code Basarisiz
  • fs.rmSync — Destructive file system operation in host/mcp-server.js
  • os.homedir — User home directory access in host/mcp-server.js
  • os.homedir — User home directory access in host/native-host.js
Permissions Gecti
  • Permissions — No dangerous permissions requested
Purpose
This MCP server and browser extension provides full browser automation for AI assistants, reverse-engineered from the official Claude extension. It intentionally removes all domain restrictions, allowing automated access to any website including banking, crypto, and social media platforms.

Security Assessment
Risk: HIGH. The tool explicitly removes all safety guardrails present in the official extension, meaning an connected AI agent can navigate to sensitive sites like banking portals, cryptocurrency wallets, and payment gateways. The codebase directly accesses the user's home directory (`os.homedir`) and executes destructive file system operations (`fs.rmSync`). While no hardcoded secrets or dangerous repository permissions were found, this fundamentally operates as a bridge giving an external AI process deep control over your active web browser.

Quality Assessment
The project is very new and lacks community validation, having only 5 GitHub stars and no explicit license file (despite the README claiming it is MIT). Because it is a clean-room reverse-engineering effort of a closed-source product, it risks breaking frequently and requires active maintenance to keep up with upstream changes. While it was updated recently, the low visibility means security vulnerabilities or malicious updates are unlikely to be caught by the community quickly.

Verdict
Not recommended for use with sensitive accounts or everyday web browsing; proceed with extreme caution.
SUMMARY

Claude in Chrome, reverse-engineered and open-source. No domain blocklist. Any Chromium browser. Same 18 MCP tools, same performance.

README.md

Open Claude in Chrome

Claude in Chrome, fully open source. No domain blocklist. Any Chromium browser.

The official Claude in Chrome extension gives Claude Code full browser automation. Open Claude in Chrome is a clean-room reimplementation that removes the restrictions while maintaining 100% feature and performance parity.

Demo

Demo: Watch Claude on Tinder, Reddit, and Robinhood | Deep dive: How I reverse-engineered it

What's Different

Claude in Chrome Open Claude in Chrome
Domain blocklist 58 blocked domains across 11 categories No blocklist. Navigate anywhere.
Browser support Chrome and Edge only Any Chromium browser (Chrome, Edge, Brave, Arc, Opera, Vivaldi, etc.)
Source code Closed source Open source (MIT)
Tools 18 MCP tools Same 18 MCP tools
Performance Baseline Identical

Blocked Domains in the Official Extension

Category Blocked Sites
Banking Chase, BofA, Wells Fargo, Citibank
Investing/Brokerage Schwab, Fidelity, Robinhood, E-Trade, Wealthfront, Betterment
Payments/Transfers PayPal, Venmo, Cash App, Zelle, Stripe, Square, Wise, Western Union, MoneyGram, Adyen, Checkout.com
BNPL Klarna, Affirm, Afterpay
Neobanks/Fintech SoFi, Chime, Mercury, Brex, Ramp
Crypto Coinbase, Binance, Kraken, MetaMask
Gambling DraftKings, FanDuel, Bet365, Bovada, PokerStars, BetMGM, Caesars
Dating Tinder, Bumble, Hinge, Match, OKCupid
Adult Pornhub, XVideos, XNXX
News/Media NYT, WSJ, Barron's, MarketWatch, Bloomberg, Reuters, Economist, Wired, Vogue
Social Media Reddit

Open Claude in Chrome has none of these restrictions.

Architecture

Claude Code <--stdio MCP--> mcp-server.js <--TCP--> native-host.js <--native messaging--> Extension <--> Browser

Three components:

  1. Extension — Manifest V3 with CDP-based browser automation (all 18 tools)
  2. MCP Server — Node.js process started by Claude Code, exposes tools via MCP
  3. Native Messaging Host — Bridge between the MCP server and the extension

Installation

Prerequisites

  • Node.js v18+
  • Any Chromium browser (Chrome, Edge, Brave, Arc, Opera, Vivaldi, etc.)
  • Claude Code v2.0.73+

Step 1: Install dependencies

cd host
npm install
cd ..

Step 2: Load the extension

  1. Go to chrome://extensions (or brave://extensions / edge://extensions)
  2. Enable Developer mode
  3. Click Load unpacked and select the extension/ directory
  4. Copy the extension ID shown under the extension name

Step 3: Register native messaging

./install.sh <your-extension-id>

If you use multiple browsers, pass all IDs:

./install.sh <chrome-id> <brave-id> <arc-id>

Step 4: Restart your browser

Close all windows and reopen. The browser reads native messaging host configs on startup.

Step 5: Add to Claude Code

claude mcp add open-claude-in-chrome -- node /absolute/path/to/host/mcp-server.js

Find the absolute path with:

echo "node $(pwd)/host/mcp-server.js"

Verification

Start a new Claude Code session and test:

Navigate to reddit.com and take a screenshot

Reddit loads. No domain restriction.

Available Tools

All 18 tools, identical to Claude in Chrome:

Tool Description
tabs_context_mcp Get tab group context
tabs_create_mcp Create new tab
navigate Navigate to URL, back, forward
computer Mouse, keyboard, screenshots (13 actions)
read_page Accessibility tree with element refs
get_page_text Extract article/main text
find Find elements by text/attributes
form_input Set form values by ref
javascript_tool Execute JS in page context
read_console_messages Console output (filtered)
read_network_requests Network activity
resize_window Resize browser window
upload_image Upload screenshot to file input
gif_creator GIF recording (stub)
shortcuts_list List shortcuts (stub)
shortcuts_execute Run shortcut (stub)
switch_browser Switch browser (stub)
update_plan Present plan (auto-approved)

Troubleshooting

Extension not connecting

  1. Verify the extension is loaded and enabled
  2. Check that ./install.sh was run with the correct extension ID
  3. Restart the browser completely (all windows)
  4. Verify the native messaging host manifest exists:
    • Chrome (macOS): ~/Library/Application Support/Google/Chrome/NativeMessagingHosts/com.anthropic.open_claude_in_chrome.json
    • Brave (macOS): ~/Library/Application Support/BraveSoftware/Brave-Browser/NativeMessagingHosts/com.anthropic.open_claude_in_chrome.json
    • Edge (macOS): ~/Library/Application Support/Microsoft Edge/NativeMessagingHosts/com.anthropic.open_claude_in_chrome.json

MCP server not found

Use an absolute path:

claude mcp add open-claude-in-chrome -- node /absolute/path/to/host/mcp-server.js

"Browser extension is not connected"

The MCP server started but the native host hasn't connected. Try:

  1. Open any webpage (wakes the service worker)
  2. Check service worker logs: chrome://extensions > "Inspect views: service worker"
  3. Verify host/native-host-wrapper.sh exists

Port conflict

Default port is 18765. To change:

  1. Create ~/.config/open-claude-in-chrome/config.json:
    { "port": 19000 }
  2. Restart browser and Claude Code

License

MIT

Built by Sebastian Sosa (Noemica)

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