Examine source code of Zeppelin

{
  "theme": {
    "images": {
      "theme_frame": "rsz_z1.jpg"
    },
    "colors": {
      "frame": "#9c9999",
      "tab_background_text": "#b5a1a1"
    }
  },
  "version": "2.0",
  "name": "Zeppelin",
  "manifest_version": 2,
  "description": "Rocks!"
}