Examine source code of Chess.com Keyboard

{
  "name": "__MSG_appName__",
  "version": "6.6.0",
  "manifest_version": 3,
  "description": "__MSG_appDescription__",
  "icons": {
    "16": "images/icon-16.png",
    "128": "images/icon-128.png"
  },
  "default_locale": "en",
  "host_permissions": [
    "https://www.chess.com/"
  ],
  "action": {
    "default_icon": "images/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.chess.com/*"
      ],
      "js": [
        "inject.js"
      ],
      "run_at": "document_start",
      "css": [
        "styles/main.css"
      ],
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "build.js"
      ],
      "matches": [
        "https://www.chess.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d4ad10df-2c4a-4d87-a75b-bd2daefd1027}",
      "strict_min_version": "109.0"
    }
  }
}