Examine source code of Pixel Cleaner

{
  "manifest_version": 2,
  "name": "Pixel Cleaner",
  "version": "1.0",
  "description": "Game mini: nhấp để lau sạch pixel bẩn trên trang web.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e9952f73-134f-4f3c-b4d6-a9c0dce0e20a}"
    }
  }
}