Examine source code of Alexander the Great

{
  "theme": {
    "images": {
      "theme_frame": "alexanderheader.jpg"
    },
    "colors": {
      "frame": "#c74444",
      "tab_background_text": "#590d0d"
    }
  },
  "version": "2.0",
  "name": "Alexander the Great",
  "manifest_version": 2,
  "description": "The Alexander Mosaic was discovered in the House of the Faun in Pompeii. This enormous depiction of a battle between Alexander the Great and Darius III of Persia once decorated a wealthy Roman's floor; now it decorates a browser."
}