Examine source code of Enter Shikari Forefox

{
  "theme": {
    "images": {
      "theme_frame": "Shikari_Firefox_Header.png"
    },
    "colors": {
      "frame": "#fcfcfc",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Enter Shikari Forefox",
  "manifest_version": 2,
  "description": "If you love Enter Shikari, Then you'll love this for your firfoz design. (:"
}