Examine source code of Word Adventure

{
  "manifest_version": 2,
  "name": "Word Adventure",
  "version": "1.0",
  "description": "A fun and educational game to improve your English vocabulary by guessing the meanings of Vietnamese words. Perfect for learners of all ages!",
  "icons": {
    "48": "word_adventure_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Word Adventure"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{437b4ca1-8086-4708-a808-b3109fe75830}"
    }
  }
}