Examine source code of Superhero Legends Quiz

{
  "manifest_version": 2,
  "name": "Superhero Legends Quiz",
  "version": "1.0",
  "description": "Famous superheroes quiz from Vietnamese clues.",
  "icons": {
    "48": "superhero_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Superhero Legends Quiz"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{243b7b61-2107-4a88-9912-b7e3c93a02b0}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}