Examine source code of GT3 WindowBlind

{
  "theme": {
    "images": {
      "theme_frame": "gt3header.jpg"
    },
    "colors": {
      "frame": "#284452",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "GT3 WindowBlind",
  "manifest_version": 2,
  "description": "This is just a personal go with the popular theme from WinCustomize (<a href=\"https://outgoing.prod.mozaws.net/v1/b1ade6bb3819df195e8e362fbc0c8f11b06798b6ffc665a6b88afd52244fe40f/http%3A//wincustomize.com/explore/windowblinds/4617/\" rel=\"nofollow\">http://wincustomize.com/explore/windowblinds/4617/</a>). All credit goes to Tiggz, the theme's creator."
}