Playwright MCP Extension Repro

Minimal reproduction showing that standard Chrome extension loading in the Playwright MCP server fails without specific configuration settings.

Feature Request: microsoft/playwright#39569

🚀 Quick Start

1. Install dependencies:

   npm install

2. Run the matrix test:

   npm test

Related MCP server: mcp-playwright

📊 What this tests

The script repro_matrix.ts compares two configurations:

1. ADVANCED_CONFIG: Uses the specific settings identified to enable extensions:

   • channel: "" (Reverts to bundled Chromium)

   • chromiumSandbox: false (Allows unpacked extension mounting)

   • allowUnrestrictedFileAccess: true (Disables protocol guard)

2. PAVEL_SUGGESTION: Uses the simplified configuration suggested in the feature request.

✅ Success Criteria

• Background Color: The extension should inject a content script that turns example.com pink (rgb(255, 192, 203)).

• Page Title: The extension should change the document title to PINK_EXT_ACTIVE.