Examine source code of Daily Math Riddle

{
  "manifest_version": 2,
  "name": "Daily Math Riddle",
  "version": "1.0",
  "description": "A quick brain workout! This extension challenges you with a new math riddle every time you open it. Perfect for sharpening your problem-solving skills in just a minute a day.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Daily Math Riddle"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{828b1648-3537-4ba0-be59-8e15a685f45e}"
    }
  }
}