Examine source code of Miami skyline sunset

{
  "theme": {
    "images": {
      "theme_frame": "MiamiSunsetSkyline2008firefox.jpg"
    },
    "colors": {
      "frame": "#f7f2f2",
      "tab_background_text": "#f5f0f0"
    }
  },
  "version": "2.0",
  "name": "Miami skyline sunset",
  "manifest_version": 2,
  "description": "Miami skyline sunset"
}