Examine source code of Planitia

{
  "theme": {
    "images": {
      "theme_frame": "hdplanita.jpg"
    },
    "colors": {
      "frame": "#7bcf9b",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Planitia",
  "manifest_version": 2,
  "description": "Firefox Persona version of my “Planitia” wallpaper. 3D artwork by Ryan Bliss. Persona Designed by Mark Hamilton for Digital Blasphemy. Wallpaper available at <a href=\"https://outgoing.prod.mozaws.net/v1/ffdd167d5cd31f9e77ce3a23295c428a08ea8c8276799feda04906b75f6fbd78/http%3A//digitalblasphemy.com/preview.shtml%3Fi=planitia\" rel=\"nofollow\">http://digitalblasphemy.com/preview.shtml?i=planitia</a>"
}