Examine source code of Lexicon Quiz

{
  "manifest_version": 3,
  "name": "Lexicon Quiz",
  "version": "1.0",
  "description": "An engaging Firefox add-on that helps you practice Vietnamese-to-English vocabulary through fun and interactive quizzes.",
  "icons": {
    "48": "lexicon_icon.png"
  },
  "action": {
    "default_popup": "index.html",
    "default_title": "Lexicon Quiz"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{68510cd8-b058-4e29-b252-6767c6758111}"
    }
  }
}