Examine source code of Wassshing

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Wassshing",
  "version": "1.3",
  "description": "Savoir quand Wassshing est en live !",
  "browser_action": {
    "default_title": "Wassshing",
    "default_popup": "index.html"
  },
  "icons": {
    "64": "img/icon-off-64.png",
    "128": "img/icon-off-128.png"
  },
  "background": {
    "scripts": [
      "js/jquery.js",
      "js/config.js",
      "js/initialization.js",
      "js/background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "storage",
    "notifications",
    "tabs",
    "https://static-cdn.jtvnw.net/"
  ]
}