Examine source code of Starbirth

{
  "theme": {
    "images": {
      "theme_frame": "hdstarbirth.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Starbirth",
  "manifest_version": 2,
  "description": "Firefox Persona version of my “Starbirth” wallpaper. \n\n3D artwork by Ryan Bliss. Persona Designed by Mark Hamilton for Digital Blasphemy.\n\nWallpaper available at <a href=\"https://outgoing.prod.mozaws.net/v1/98c64458991a6faa1deab5cf7b2f37f4d7d000cef57c351284723c085ae24d41/http%3A//digitalblasphemy.com/preview.shtml%3Fi=starbirth2k81\" rel=\"nofollow\">http://digitalblasphemy.com/preview.shtml?i=starbirth2k81</a>"
}