Examine source code of Starfall

{
  "theme": {
    "images": {
      "theme_frame": "Header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Starfall",
  "manifest_version": 2,
  "description": "Image from <a href=\"https://outgoing.prod.mozaws.net/v1/fc35390b38734e0556cf07426adde6b02c1347de17f21e68bd00dd10055c93bb/http%3A//www.vladstudio.com\" rel=\"nofollow\">http://www.vladstudio.com</a>"
}