Examine source code of World Public Library

{
  "theme": {
    "images": {
      "theme_frame": "wplheader.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#161a36"
    }
  },
  "version": "2.0",
  "name": "World Public Library",
  "manifest_version": 2,
  "description": "The World Public Library Personas for Firefox header and footer was designed to match the navigational theme at <a href=\"https://outgoing.prod.mozaws.net/v1/e4adfa2f0d91d0c072cdd2af6022b66df26d4174964fddff5702fa8fa5764001/http%3A//WorldLibrary.net\" rel=\"nofollow\">WorldLibrary.net</a>"
}