Examine source code of Ardennes Sunset

{
  "theme": {
    "images": {
      "theme_frame": "header-tree.png"
    },
    "colors": {
      "frame": "#a8c5ff",
      "tab_background_text": "#93aeed"
    }
  },
  "version": "2.0",
  "name": "Ardennes Sunset",
  "manifest_version": 2,
  "description": "Sunset at the Ardennes.."
}