Examine source code of old stony bridge

{
  "theme": {
    "images": {
      "theme_frame": "oldstonybridge.jpg"
    },
    "colors": {
      "frame": "#999393",
      "tab_background_text": "#85d47d"
    }
  },
  "version": "2.0",
  "name": "old stony bridge",
  "manifest_version": 2,
  "description": "an old stone bridge over a creek"
}