Examine source code of Gacha Life 2

{
  "browser_action": {
    "default_icon": {
      "16": "logo_128.png",
      "32": "logo_128.png",
      "48": "logo_128.png",
      "128": "logo_128.png"
    },
    "default_popup": "index.html"
  },
  "description": "Download Gacha Life 2 and Play Online. Enjoy your favourite game apk online for free.",
  "icons": {
    "16": "logo_128.png",
    "32": "logo_128.png",
    "48": "logo_128.png",
    "128": "logo_128.png"
  },
  "manifest_version": 2,
  "name": "Gacha Life 2",
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "1.0"
}