silverstripe-webpack/app/client/dist/icons/manifest.webapp

{
  "version": "1.0",
  "name": "Webpack App",
  "description": null,
  "icons": {
    "60": "firefox_app_60x60.png",
    "128": "firefox_app_128x128.png",
    "512": "firefox_app_512x512.png"
  },
  "developer": {
    "name": null,
    "url": null
  }
}