Examine source code of Quick Math Challenge

{
  "manifest_version": 2,
  "name": "Quick Math Challenge",
  "version": "1.0",
  "description": "A fun browser game where you solve random math problems to test and improve your calculation speed.",
  "icons": {
    "48": "vocab_icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Quick Math Challenge"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{03ae0ecd-c2ab-48c2-a0c1-67c606d8aa66}"
    }
  }
}