Examine source code of Trees and Snow

{
  "theme": {
    "images": {
      "theme_frame": "SnowandTrees.jpg"
    },
    "colors": {
      "frame": "#170730",
      "tab_background_text": "#b7d3e8"
    }
  },
  "version": "2.0",
  "name": "Trees and Snow",
  "manifest_version": 2,
  "description": "Looking over Edinburgh in the lovely winter sunshine ...up to our knees in the white stuff"
}