Examine source code of Tango Down

{
  "theme": {
    "images": {
      "theme_frame": "TD_persona_header.jpg"
    },
    "colors": {
      "frame": "#59ff00",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Tango Down",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/f713b6fe8cdbc96336c2bf35be3bc230972a893c7a6aab74f1dc65ff48a1abcc/http%3A//tangodown.it\" rel=\"nofollow\">tangodown.it</a> custom persona made by papaoscarzulu"
}