Examine source code of River and Hills

{
  "theme": {
    "images": {
      "theme_frame": "riverbank001.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "River and Hills",
  "manifest_version": 2,
  "description": "An old Mac Paint tree overlooking the river.  Several copies with various effects and placed on a Gimp background."
}