- Add browser_install_extension, browser_list_extensions, browser_uninstall_extension tools
- Support session-based extension isolation between MCP clients
- Extensions loaded via --load-extension Chrome flags at browser startup
- Browser auto-restarts when extensions are added/removed
- Validation ensures extensions only work with Chromium browser
- Warning system for Chrome channel vs pure Chromium compatibility
- Extension management persists across page navigations within session
- Updated README with complete extension tool documentation
🤖 Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>
* HTTPS server launched and the relay server is created before MCP
server. This way we can pass CDP endpoint to its constructor.
* MCP HTTP transport is added to precreated HTTP server.
* A bunch of renames to fix style issues.
Instructions:
1. `git clone https://github.com/mxschmitt/playwright-mcp && git
checkout extension-drafft`
2. `npm ci && npm run build`
3. `chrome://extensions` in your normal Chrome, "load unpacked" and
select the extension folder.
4. `node cli.js --port=4242 --extension` - The URL it prints at the end
you can put into the extension popup.
5.
Put either this into Claude Desktop (it does not support SSE yet hence
wrapping it or just put the URL into Cursor/VSCode)
```json
{
"mcpServers": {
"playwright": {
"command": "bash",
"args": [
"-c",
"source $HOME/.nvm/nvm.sh && nvm use --silent 22 && npx supergateway --streamableHttp http://127.0.0.1:4242/mcp"
]
}
}
}
```
Things like `Take a snapshot of my browser.` should now work in your
Prompt Chat.
----
- SSE only for now, since we already have a http server with a port
there
- Upstream "page tests" can be executed over this CDP relay via
https://github.com/microsoft/playwright/pull/36286
- Limitations for now are everything what happens outside of the tab its
session is shared with -> `window.open` / `target=_blank`.
---------
Co-authored-by: Yury Semikhatsky <yurys@chromium.org>
