Examine source code of Frozen Dark Night

{
  "theme": {
    "images": {
      "theme_frame": "dark_header.jpg"
    },
    "colors": {
      "frame": "#030303",
      "tab_background_text": "#b5a3a3"
    }
  },
  "version": "2.0",
  "name": "Frozen Dark Night",
  "manifest_version": 2,
  "description": "Darkness, icy and reflective."
}