Examine source code of Word Match Game

{
  "manifest_version": 2,
  "name": "Word Match Game",
  "version": "1.0",
  "description": "A fun Firefox extension to enhance your Vietnamese-to-English vocabulary skills through an interactive multiple-choice word matching game.",
  "icons": {
    "48": "match_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Word Match Game"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4d00f6b0-af8e-472a-a2fc-23b907a41ca7}"
    }
  }
}