Examine source code of Escher Matamorphose

{
  "theme": {
    "images": {
      "theme_frame": "escher_metamorphose.jpg"
    },
    "colors": {
      "frame": "#d1c6c6",
      "tab_background_text": "#33d44b"
    }
  },
  "version": "2.0",
  "name": "Escher Matamorphose",
  "manifest_version": 2
}