Examine source code of Cathedrals

{
  "theme": {
    "images": {
      "theme_frame": "collage4.jpg"
    },
    "colors": {
      "frame": "#786565",
      "tab_background_text": "#f2f7af"
    }
  },
  "version": "2.0",
  "name": "Cathedrals",
  "manifest_version": 2,
  "description": "Some cathedral photos."
}