Examine source code of Throwdown

{
  "theme": {
    "images": {
      "theme_frame": "grim-reaper-black-pattern.jpg"
    },
    "colors": {
      "frame": "#363636",
      "tab_background_text": "#9c0000"
    }
  },
  "version": "2.0",
  "name": "Throwdown",
  "manifest_version": 2,
  "description": "throwdown, awesome band."
}