Examine source code of FURL3X

{
  "manifest_version": 2,
  "name": "FURL3X",
  "version": "2.0.0",
  "description": "Soit notifié lorsque FURL3X lance son live et sort une nouvelle vidéo Youtube !",
  "author": "Frédéric GOMEL",
  "icons": {
    "48": "Furl3x_Icon_White.b4e59b88.png"
  },
  "background": {
    "scripts": [
      "background.aaa4fbdb.js"
    ]
  },
  "browser_action": {
    "default_icon": "Furl3x_Icon_White.b4e59b88.png",
    "default_title": "FURL3X",
    "default_popup": "popup.9f247943.html"
  },
  "permissions": [
    "notifications",
    "alarms",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{31d66aef-fc18-4d4c-a44f-ad58fc7b72ba}"
    }
  }
}