Examine source code of tron legacy gem

{
  "theme": {
    "images": {
      "theme_frame": "1gem-header.jpg"
    },
    "colors": {
      "frame": "#9db0c2",
      "tab_background_text": "#8ad3d4"
    }
  },
  "version": "2.0",
  "name": "tron legacy gem",
  "manifest_version": 2,
  "description": "inspired by gem of tron. something simple, please enjoy"
}