Examine source code of Kyria Alert

{
  "manifest_version": 2,
  "name": "Kyria Alert",
  "short_name": "Kyrialert",
  "description": "__MSG_extensionDescription__",
  "default_locale": "fr",
  "version": "0.0.1.4resigned1",
  "author": "Akitake",
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "permissions": [
    "notifications",
    "storage",
    "https://*.twitch.tv/kraken/*",
    "https://twitch.tv/kyriatv"
  ],
  "background": {
    "scripts": [
      "/js/jquery.min.js",
      "app.js"
    ]
  },
  "icons": {
    "16": "/resources/icon-16.png",
    "48": "/resources/icon-48.png",
    "128": "/resources/icon-128.png"
  },
  "browser_action": {
    "default_icon": "/resources/kyria_38x_off.png",
    "default_title": "Kyrialert - Hors ligne",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3dd12ee0-7d55-48ae-a98d-554e25fceeeb}"
    }
  }
}