Examine source code of MixRadio

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "MixRadio",
  "manifest_version": 2,
  "description": "Theme using my company logo.\nMixRadio is a music streaming service, check us out at:\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/383ef7e14def7554e88857a9ec104961f3941d8e43e3e5b4486c52e2d649ce54/http%3A//www.mixrad.io\">www.mixrad.io</a>"
}