Examine source code of Awolnes

{
  "manifest_version": 2,
  "name": "Awolnes",
  "version": "1.2.12",
  "description": "Extension chrome et firefox pour suivre les lives d'Awolnes",
  "icons": {
    "128": "logo/icon.png"
  },
  "browser_action": {
    "default_icon": "logo/Icones.png",
    "default_popup": "index.html",
    "default_title": "Awolnes"
  },
  "background": {
    "scripts": [
      "script.js"
    ]
  },
  "permissions": [
    "https://api.twitch.tv/",
    "notifications",
    "tabs",
    "storage"
  ]
}