Examine source code of Yurioshi

{
  "manifest_version": 2,
  "name": "Yurioshi",
  "version": "1.0.1",
  "description": "Restez informé quand Yurioshi est en live",
  "browser_action": {
    "default_popup": "index.html"
  },
  "icons": {
    "128": "img/icon_on.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "notifications"
  ]
}