Examine source code of Power Button

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Power Button",
  "manifest_version": 2,
  "description": "Stock credit: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/b69848dd7113726065a18defaf3d5c41a5bb8b5959e04f2451eff207e09b8f80/https%3A//pixabay.com/en/users/intographics-2633886/\">intographics\n</a>"
}