Examine source code of RISC OS

{
  "theme": {
    "images": {
      "theme_frame": "bg.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "RISC OS",
  "manifest_version": 2,
  "description": "A simple persona resembling RISC OS' default theme; works well on Linux with the Gtk theme at <a href=\"https://outgoing.prod.mozaws.net/v1/3267238d0b9cf094dd8c668395a18a2091a7e1e88f17f6bad88f217d037126dd/http%3A//ubuntu-art.org/content/show.php/RiscOS%3Fcontent=128771\" rel=\"nofollow\">http://ubuntu-art.org/content/show.php/RiscOS?content=128771</a>. The image used is licensed under the GPL."
}