Examine source code of Sylt 4 U

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_TEMPLATE_1.jpg"
    },
    "colors": {
      "frame": "#4d4b4b",
      "tab_background_text": "#d9cece"
    }
  },
  "version": "2.0",
  "name": "Sylt 4 U",
  "manifest_version": 2,
  "description": "View from the South of Sylt, island in Germany. You can see another island called Amrum."
}