Examine source code of Oldmap

{
  "theme": {
    "images": {
      "theme_frame": "oldmap1.jpg"
    },
    "colors": {
      "frame": "#7149a6",
      "tab_background_text": "#f5eec1"
    }
  },
  "version": "2.0",
  "name": "Oldmap",
  "manifest_version": 2,
  "description": "Oldmap for a good trip."
}