Examine source code of Language Ladder

{
  "manifest_version": 2,
  "name": "Language Ladder",
  "version": "1.0",
  "description": "Master essential Vietnamese vocabulary through quick, interactive daily quizzes. Build your language skills one word at a time with engaging challenges.",
  "icons": {
    "48": "ladder_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Language Ladder"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ed1bba3b-2bcd-4eb4-b32d-184e2b97d6f2}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}