Examine source code of Daily Geography Challenge

{
  "manifest_version": 2,
  "name": "Daily Geography Challenge",
  "version": "1.0",
  "description": "Test your world knowledge daily! This extension presents a quick geography question each time you open it. Great for travelers and explorers at heart.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Daily Geography Challenge"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3c759763-1c61-4342-9777-96d27d05b3ea}"
    }
  }
}