Examine source code of Himmel.x3

{
  "theme": {
    "images": {
      "theme_frame": "Himmel_01.jpg"
    },
    "colors": {
      "frame": "#007c8c",
      "tab_background_text": "#070036"
    }
  },
  "version": "2.0",
  "name": "Himmel.x3",
  "manifest_version": 2,
  "description": "Look into the sky!"
}