Examine source code of Cartolineweb

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Cartolineweb",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/a89d8636f94d72150d26d1349a46f1b02a7702c53ecc1b1c51431060c3975bfa/http%3A//www.cartolineweb.net\" rel=\"nofollow\">www.cartolineweb.net</a> design"
}