Examine source code of The Linux Box

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "The Linux Box",
  "manifest_version": 2,
  "description": "This theme stars a Matrix style Tux (Tux as in the Linux mascot). I based this theme on my website: <a href=\"https://outgoing.prod.mozaws.net/v1/7f655a93636c5a3cda0b17602dd5259c593b7fa77bae6eb387071d432b52713d/http%3A//thelinuxbox.org\" rel=\"nofollow\">http://thelinuxbox.org</a>"
}