Examine source code of Color Arch

{
  "theme": {
    "images": {
      "theme_frame": "archh.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Color Arch",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/f872b58c1f7c6aec76693bc83e7376b035fb7a152c087b407c8367b7f98377a9/http%3A//www.colourlovers.com/pattern/940757/color_arch\" rel=\"nofollow\">http://www.colourlovers.com/pattern/940757/color_arch</a>"
}