node_modules/node-firefox-install-app/examples/sampleApp/manifest.webapp

{
  "name": "node-firefox-install-app",
  "description": "A test app for this module",
  "launch_path": "/index.html",
  "icons": {
    "16": "/icons/icon16x16.png",
    "48": "/icons/icon48x48.png",
    "60": "/icons/icon60x60.png",
    "128": "/icons/icon128x128.png"
  }
}