Examine source code of Snakou

{
  "name": "Snakou",
  "description": "Ne rate plus aucun live ni aucune vidéo avec la Master Extension !",
  "version": "2.9.1",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "background": {
    "scripts": [
      "js/config.js",
      "libs/jquery.min.js",
      "js/fonctions.js",
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_title": "Snakou",
    "default_icon": "images/icon128.png",
    "default_popup": "html/popup.html"
  },
  "applications": {
    "gecko": {
      "id": "extension@mastersnakou.fr"
    }
  },
  "permissions": [
    "storage",
    "notifications",
    "tabs",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://game.mastersnakou.fr/"
      ],
      "js": [
        "libs/jquery.min.js",
        "js/username-grabber.js"
      ]
    },
    {
      "matches": [
        "https://www.twitch.tv/mastersnakou"
      ],
      "js": [
        "libs/jquery.min.js",
        "libs/socket.io.min.js",
        "js/twitch-event.js"
      ],
      "css": [
        "css/twitch-event.css"
      ]
    }
  ],
  "manifest_version": 2
}