Examine source code of By Jogalo

{
  "theme": {
    "images": {
      "theme_frame": "personas-jogalo.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "By Jogalo",
  "manifest_version": 2,
  "description": "A nice design for game lovers.\n<a href=\"https://outgoing.prod.mozaws.net/v1/5d0b13e059c37f1073ddc07033336ff801c0aa7df746e257a1c0f27b5116c00a/http%3A//www.jogalo.com\" rel=\"nofollow\">www.jogalo.com</a>"
}