Examine source code of Mt Rushmore

{
  "theme": {
    "images": {
      "theme_frame": "Mt-Rushmore_header.jpg"
    },
    "colors": {
      "frame": "#cfcfcf",
      "tab_background_text": "#fffed1"
    }
  },
  "version": "2.0",
  "name": "Mt Rushmore",
  "manifest_version": 2,
  "description": "Mt. Rushmore. This version is more comfortable with a few toolbars, as it is a larger image and the perspective from the outdoor gallery shows the faces at their different heights.  Photo by Doug Peters."
}