Examine source code of Lolox - Extension

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Lolox - Extension",
  "description": "Soyez au courant quand Lolox lance son live ! Extension faite par leo_lm9 © Copiright, tous droits réservés",
  "author": "leo_lm9",
  "version": "2.2",
  "permissions": [
    "https://api.twitch.tv/helix/streams",
    "activeTab",
    "storage",
    "tabs",
    "notifications"
  ],
  "browser_action": {
    "default_popup": "index.html"
  },
  "icons": {
    "128": "img/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}