Browser MCP by Agent360

Control your real Chrome from Claude Code — with your logins, cookies, and 2FA.

The only browser MCP with multi-session support (10 concurrent AI sessions), human-in-the-loop (2FA, CAPTCHA, credentials), and built-in provider integrations (Stripe, HubSpot, Slack, and 6 more). 34 tools total.

Install — 2 steps (~60 seconds)

Step 1: Configure the MCP server

npx @agent360/browser-mcp install

This copies the Chrome extension files to ~/.browser-mcp/extension/ and adds the MCP server to your Claude Code config. You'll see the path to the extension folder printed in the terminal — copy it.

Step 2: Load the extension in Chrome

Chrome won't let extensions install themselves from npm — you load it manually one time. To update later, re-run the install command and reload it (see Keeping it updated). Prefer the Chrome Web Store install if you'd rather have the extension auto-update.

1. Open Chrome and type chrome://extensions in the address bar
2. Toggle "Developer mode" ON (top right corner)
3. Click "Load unpacked" (top left, next to "Pack extension")
4. Navigate to ~/.browser-mcp/extension/ and click "Select"
   • On Mac: Press Cmd+Shift+G in the file picker, paste ~/.browser-mcp/extension/, press Enter
   • On Windows: Paste %USERPROFILE%\.browser-mcp\extension\ in the address bar
   • On Linux: Type ~/.browser-mcp/extension/ in the path field
5. Restart Claude Code so it picks up the new MCP server

That's it. The Browser MCP icon will appear in your toolbar, and 34 browser tools are now available in Claude Code.

Alternative: Manual zip download (no npm)

If you don't want to use npm, download the extension directly:

1. Download browser-mcp-v1.23.0.zip from the latest GitHub release
2. Unzip the file (anywhere — e.g. ~/Downloads/browser-mcp-extension/)
3. Follow Step 2 above, but select the unzipped folder instead of ~/.browser-mcp/extension/
4. Configure Claude Code manually by adding this to your ~/.claude.json (or run npx @agent360/browser-mcp install --skip-extension):

   {
     "mcpServers": {
       "browser-mcp": {
         "command": "npx",
         "args": ["@agent360/browser-mcp"]
       }
     }
   }

Chrome Web Store (one-click install)

Install from Chrome Web Store →

No Developer mode needed. Then run npx @agent360/browser-mcp install --skip-extension to configure Claude Code.

Why This Over Playwright MCP / BrowserMCP?

| | Browser MCP | Playwright MCP | BrowserMCP.io | |---|---|---|---| | Browser | Your real Chrome | Headless (new session) | Your real Chrome | | Logins/cookies | Already authenticated | Must log in every time | Already authenticated | | Multi-session | 10 concurrent sessions with color-coded tab groups | Single session | Single session | | Human-in-the-loop | browser_ask_user — 2FA, CAPTCHA, credential input | None | None | | Provider integrations | 9 built-in (Stripe, HubSpot, Slack...) | None | None | | CORS bypass | browser_fetch from extension background | N/A | Limited | | Network monitoring | browser_wait_for_network via CDP | Built-in | None | | CSP-strict sites | Chrome Debugger API throughout | Works (headless) | Limited | | Custom dropdowns | Angular Material, React Select support | Works (headless) | Limited | | Install | npx @agent360/browser-mcp install | npx @anthropic-ai/mcp-playwright | Manual clone |

34 Tools

Navigation & Content

| Tool | Description | |------|-------------| | browser_navigate | Navigate to URL (reuses tab, or new_tab=true) | | browser_get_page_content | Get page text or HTML | | browser_screenshot | Screenshot via Chrome Debugger (works even when tab isn't focused) | | browser_execute_script | Run JavaScript in page context |

Interaction

| Tool | Description | |------|-------------| | browser_click | Click via CSS or text selector (text=Submit, button:text(Next)) | | browser_fill | Fill input fields (works on CSP-strict sites) | | browser_press_key | Keyboard events (Enter, Tab, Escape, modifiers) | | browser_scroll | Scroll to element or by pixels | | browser_wait | Wait for element to appear | | browser_hover | Hover for tooltips/dropdowns | | browser_select_option | Native <select> + custom dropdowns (Angular Material, React Select) | | browser_set_combobox | Autocomplete/combobox: type query → wait for filtered listbox → click option (multi-value chip support). Use when browser_select_option fails on lazy-rendered options | | browser_set_date | Robust date inputs: tries native value-set → masked typing → calendar-picker navigation (MUI/AntD/react-datepicker/Lexical). Use when browser_fill fails on date fields | | browser_dismiss_overlays | Bulk-dismiss popups/modals/tooltips/banners via aria-label/text/×-char heuristics. non_critical mode preserves dialogs with form data | | browser_handle_dialog | Accept/dismiss native alert/confirm/prompt dialogs |

Tabs & Frames

| Tool | Description | |------|-------------| | browser_list_tabs | List session's tabs only | | browser_switch_tab | Switch to tab by ID | | browser_close_tab | Close tab (session-owned only) | | browser_get_new_tab | Get most recently opened tab (OAuth popups) | | browser_list_frames | List iframes on page | | browser_select_frame | Execute JS in specific iframe |

Data & Network

| Tool | Description | |------|-------------| | browser_get_cookies | Get cookies for domain | | browser_get_local_storage | Read localStorage | | browser_fetch | HTTP request from extension (bypasses CORS) | | browser_wait_for_network | Wait for specific API call to complete | | browser_extract_token | Navigate to provider dashboard + extract API token |

CAPTCHA Solving

| Tool | Description | |------|-------------| | browser_solve_captcha | Detect and solve CAPTCHAs. Auto-detects reCAPTCHA v2/v3, hCaptcha, Turnstile, FunCaptcha. Actions: detect, click_checkbox (auto-click, ~80% pass with Google login), click_grid (AI vision guided), ask_human (fallback) |

Human-in-the-Loop

| Tool | Description | |------|-------------| | browser_ask_user | Show overlay dialog for 2FA, CAPTCHA, credentials, or any user input |

Data

| Tool | Description | |------|-------------| | browser_get_cookies | Get cookies for a domain | | browser_set_cookies | Set cookies for a domain | | browser_get_local_storage | Read localStorage from page | | browser_set_local_storage | Write localStorage values | | browser_console_logs | Capture console.log/warn/error messages from page | | browser_upload_file | Upload files to <input type="file"> via Chrome Debugger API (no dialog) | | browser_drop_file | Upload via drop-zones: finds hidden <input type="file"> in target subtree/parent (up to 2 levels). Use when browser_upload_file fails because the zone has no visible input |

Multi-Session Support

Each Claude Code conversation gets its own MCP server on a unique port (9876-9885). The Chrome extension connects to all active servers simultaneously.

Claude Session 1 ←(stdio)→ MCP :9876 ←(WS)→
Claude Session 2 ←(stdio)→ MCP :9877 ←(WS)→  Chrome Extension → Browser
Claude Session 3 ←(stdio)→ MCP :9878 ←(WS)→

• Session isolation — each session gets a color-coded Chrome Tab Group
• Tab ownership — sessions can only see and control their own tabs
• Auto-cleanup — processes exit when Claude Code closes the conversation

Built-in Provider Integrations

browser_extract_token navigates to the provider's API settings page and guides token extraction:

| Provider | Token Format | Dashboard | |----------|-------------|-----------| | Stripe | sk_test_... / sk_live_... | stripe.com/apikeys | | HubSpot | pat-... | app.hubspot.com | | Slack | xoxb-... | api.slack.com/apps | | Shopify | Admin API token | admin.shopify.com | | Pipedrive | UUID | app.pipedrive.com | | Calendly | JWT | calendly.com | | Mailchimp | ...-us1 | admin.mailchimp.com | | Google | OAuth Client | console.cloud.google.com | | LinkedIn | Client ID/Secret | linkedin.com/developers |

Architecture

extension/
  manifest.json       # Manifest V3
  background.js       # Service worker — Chrome API dispatcher, session tab groups
  offscreen.js        # Persistent WebSocket bridge (multi-port scanning)
  popup.html/js       # Status UI — sessions, tabs, action log

mcp-server/
  index.js            # MCP server (stdio) + WebSocket client
  tools.js            # 34 tool definitions
  bin/cli.js          # Install CLI

How It Works

1. Claude Code starts → spawns MCP server via stdio
2. MCP server binds to first available port (9876-9885)
3. Extension's offscreen document scans ports every 2s
4. WebSocket connection established
5. Commands flow: Claude Code → MCP → Extension → Chrome APIs
6. Process auto-exits when Claude Code closes (stdin detection)

Keeping it updated

Browser MCP has two parts, and they update independently — how the extension updates depends on how you installed it:

| Part | Install method | How it updates | |------|----------------|----------------| | MCP server | any | Automatic. Runs via npx @agent360/browser-mcp@latest, so every Claude Code session pulls the newest from npm. Nothing to do. | | Extension | Chrome Web Store | Automatic. Chrome updates it in the background (usually within a few hours). Nothing to do. | | Extension | Unpacked (npx … install or manual zip) | Manual. Chrome never auto-updates a load-unpacked extension. Re-run npx @agent360/browser-mcp install, then open chrome://extensions → Browser MCP → ↻ reload. |

Not sure which you have? Open chrome://extensions and find Browser MCP. If it shows a "Loaded from /path/…" line, it's unpacked (manual updates). If there's no such line, it came from the Chrome Web Store (auto-updates).

Want zero-maintenance updates? Install the extension from the Chrome Web Store, then run npx @agent360/browser-mcp install --skip-extension to wire up just the MCP server. After that, both parts stay current on their own.

Troubleshooting

"Chrome extension not connected"

• Check extension is loaded in chrome://extensions
• Click the extension popup → "Reconnect"
• Wait 2-3 seconds for port scan

Screenshot fails

• Uses Chrome Debugger API (works even when tab isn't focused)
• Falls back to captureVisibleTab if debugger unavailable

Click doesn't work on SPA

• Try text selector: browser_click("text=Submit")
• Uses real mouse events via Chrome Debugger API automatically

Stale processes

• Processes auto-exit when Claude Code closes (stdin detection)
• Idle timeout: 4 hours without commands → auto-exit
• Manual cleanup: lsof -i :9876-9885 | grep LISTEN

💡 Help Shape Browser MCP

Browser MCP is built in the open and shaped by the people using it.

Browse what others want / built

• 💡 Wishlist → — features people are asking for
• 🎯 Use-cases → — what others have built (LinkedIn ICP scraping, vendor research, daily ops, …)

Contribute in 30 seconds

• 💡 Wish for a feature
• 🎯 Share a use-case
• 🐛 Report a bug

Or just ask Claude — it knows about the browser_about tool and will draft + submit on your behalf when you say things like "I wish browser-mcp could …" or "share my browser-mcp use-case".

License

MIT — Agent360