Examine source code of Osborne

{
  "theme": {
    "images": {
      "theme_frame": "osborne.jpg"
    },
    "colors": {
      "frame": "#c0c0c0",
      "tab_background_text": "#99ff99"
    }
  },
  "version": "2.0",
  "name": "Osborne",
  "manifest_version": 2,
  "description": "Osborne One computer. Image by Marcin Wichary (<a href=\"https://outgoing.prod.mozaws.net/v1/7827bdb00197c3e2c2aa96a8664d4e596c59d0bb33c4e5433b75e7ca6bfb3555/http%3A//www.flickr.com/photos/mwichary/2319910132/sizes/l/\" rel=\"nofollow\">http://www.flickr.com/photos/mwichary/2319910132/sizes/l/</a>\n), used under Creative Commons attribution license."
}