Examine source code of Desk Light

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Desk Light",
  "manifest_version": 2,
  "description": "I have used my wallpaper to make this theme <a href=\"https://outgoing.prod.mozaws.net/v1/c53f17941c00c3e5a42478697c73843ceb7245c7570f8cef1817e79dcc3f3da0/http%3A//kiriyard.com/nightlights\" rel=\"nofollow\">http://kiriyard.com/nightlights</a>, I have put wood texture as background."
}