Examine source code of VietWords Puzzle

{
  "manifest_version": 2,
  "name": "VietWords Puzzle",
  "version": "1.0",
  "description": "A fun browser extension to test and improve your Vietnamese-to-English phrase translation skills through interactive quizzes.",
  "icons": {
    "48": "phrase_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "VietWords Puzzle"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5efd72e6-3a7a-4a4b-9fa5-85413ce52e10}"
    }
  }
}