Examine source code of thedigitalset.com

{
  "theme": {
    "images": {
      "theme_frame": "TDSPersonaHeader.jpg"
    },
    "colors": {
      "frame": "#136dbd",
      "tab_background_text": "#e8a507"
    }
  },
  "version": "2.0",
  "name": "thedigitalset.com",
  "manifest_version": 2,
  "description": "A persona for <a href=\"https://outgoing.prod.mozaws.net/v1/3b97b364b14f35df3a3f7bfe5af66c8ef0c4af2df5aa7d570727844eddb3b1d0/http%3A//www.thedigitalset.com/\" rel=\"nofollow\">http://www.thedigitalset.com/</a>"
}