Examine source code of Mini Games Hub

{
  "manifest_version": 2,
  "name": "Mini Games Hub",
  "version": "1.0",
  "description": "Quick access to fun mini games.",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a9c2e1a3-b696-4a06-9f38-263f2bb82f48}"
    }
  }
}