Examine source code of TwitchPoints

{
  "manifest_version": 2,
  "name": "TwitchPoints",
  "version": "1.3",
  "description": "Recoge los puntos de canal de Twitch que estes visualizando de manera automatica.",
  "icons": {
    "48": "icons/icon_48.png",
    "96": "icons/icon_96.png"
  },
  "applications": {
    "gecko": {
      "id": "admin@blaron.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ]
}