Examine source code of Hanafuda Online Plus

{
  "manifest_version": 2,
  "name": "Hanafuda Online Plus",
  "version": "1.1",
  "description": "Ajoute des fonctions au jeu hanafuda online.",
  "icons": {
    "16": "icons/hanafudaOnlinePlus_extensions.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.hanafuda.online/*"
      ],
      "css": [
        "hanafudaOnline.css"
      ],
      "js": [
        "hanafudaOnline.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "hanafudaOnlinePlus@gt-itech.com",
      "strict_min_version": "48.0"
    }
  }
}