Examine source code of N24 Style

{
  "theme": {
    "images": {
      "theme_frame": "n241-o.jpg"
    },
    "colors": {
      "frame": "#d6d3d3",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "N24 Style",
  "manifest_version": 2,
  "description": "N24 Style by Detlef Graf von Mainberg"
}