Examine source code of Fire Fox Start

{
  "theme": {
    "images": {
      "theme_frame": "preview_large07.jpg"
    },
    "colors": {
      "frame": "#f2e6e6",
      "tab_background_text": "#f5eded"
    }
  },
  "version": "2.0",
  "name": "Fire Fox Start",
  "manifest_version": 2,
  "description": "Firefox START"
}