Examine source code of Sports & Games

{
  "manifest_version": 2,
  "name": "Sports & Games",
  "version": "1.0",
  "description": "Popup game to practice Vietnamese names of sports and common games in English – useful for hobbies and leisure conversation.",
  "icons": {
    "48": "sports_games_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Sports & Games"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{23194a73-4a16-4b84-a032-dc11831edca5}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}