Examine source code of Idiom Explorer

{
  "manifest_version": 2,
  "name": "Idiom Explorer",
  "version": "1.0",
  "description": "An interactive browser pop-up game that challenges users to match Vietnamese idioms with their correct meanings, promoting language learning and cultural understanding.",
  "icons": {
    "48": "idiom_explorer_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Idiom Explorer"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1d55ccda-fcd0-4cd3-b08b-c3ea10c54149}"
    }
  }
}