Examine source code of old big apple

{
  "theme": {
    "images": {
      "theme_frame": "oldbigapple.jpg"
    },
    "colors": {
      "frame": "#d9d2d2",
      "tab_background_text": "#c9c3c3"
    }
  },
  "version": "2.0",
  "name": "old big apple",
  "manifest_version": 2,
  "description": "old picture of new york"
}