Examine source code of Constellations Quiz

{
  "manifest_version": 2,
  "name": "Constellations Quiz",
  "version": "1.0",
  "description": "Famous constellations quiz from Vietnamese clues.",
  "icons": {
    "48": "stars_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Constellations Quiz"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{99c425b7-660c-4562-8427-e85399126a87}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}