Examine source code of Capital Quest Challenge

{
  "manifest_version": 2,
  "name": "Capital Quest Challenge",
  "version": "1.0",
  "description": "Explore the world’s capitals in English! This popup quiz gives a Vietnamese clue about a country or its capital city — guess the capital name in English. Perfect for geography lovers, travelers, and learners building global knowledge.",
  "icons": {
    "48": "capital_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Capital Quest Challenge"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{dfd3adb5-0d2c-4dd8-97ca-01ecf3683c58}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}