examples.waku.org/examples/relay-js/manifest.json

{
  "name": "Relay JS",
  "description": "This example uses Waku Relay to send and receive simple text messages.",
  "icons": [
    {
      "src": "favicon.ico",
      "sizes": "64x64 32x32 24x24 16x16",
      "type": "image/x-icon"
    },
    {
      "src": "favicon.png",
      "type": "image/png",
      "sizes": "192x192"
    }
  ],
  "display": "standalone",
  "theme_color": "#ffffff",
  "background_color": "#ffffff"
}