Examine source code of Umgekehrte Bildersuche

{
  "manifest_version": 3,
  "name": "Search for Image",
  "short_name": "Image Search",
  "version": "1.1",
  "description": "Search for Image on Yandex, Google, TinyEye or Bing",
  "permissions": [
    "cookies",
    "contextMenus"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/imagesearch16.png",
    "32": "icons/imagesearch32.png",
    "48": "icons/imagesearch48.png",
    "64": "icons/imagesearch64.png",
    "128": "icons/imagesearch128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jay-es@hotmail.com"
    }
  }
}