Examine source code of Fullscreen On Load

{
  "manifest_version": 2,
  "name": "Fullscreen On Load",
  "version": "0.5",
  "description": "特定のページを開いたとき、フルスクリーンにします。",
  "icons": {
    "48": "icon.svg"
  },
  "permissions": [
    "*://*/*",
    "webNavigation",
    "storage"
  ],
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "applications": {
    "gecko": {
      "id": "{c017af57-fe03-4056-bc42-b2cf53ec8541}"
    }
  }
}