Examine source code of MODSonline Dark

{
  "theme": {
    "images": {
      "theme_frame": "persona_mods_2_head.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#cccccc"
    }
  },
  "version": "2.0",
  "name": "MODSonline Dark",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/649231f76c2496b24210d1fadac31475a88c66dba55d7722d448995cdd41a289/http%3A//MODSonline.com\" rel=\"nofollow\">MODSonline.com</a> dark theme."
}