Examine source code of Inca stone wall

{
  "theme": {
    "images": {
      "theme_frame": "BrickTop.png"
    },
    "colors": {
      "frame": "#c0c0c0",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Inca stone wall",
  "manifest_version": 2,
  "description": "Simple shaded stone blocks"
}