Examine source code of World Landmark Explorer

{
  "manifest_version": 2,
  "name": "World Landmark Explorer",
  "version": "1.0",
  "description": "Embark on a global journey! Test your geography and culture knowledge by guessing famous world landmarks and historical monuments from around the globe.",
  "icons": {
    "48": "landmark_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "World Landmark Explorer"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6bb91226-cd27-4052-a44b-3bbc646fc1c3}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}