Examine source code of Thrash & Metal

{
  "theme": {
    "images": {
      "theme_frame": "barra.jpg"
    },
    "colors": {
      "frame": "#fffb00",
      "tab_background_text": "#fbff00"
    }
  },
  "version": "2.0",
  "name": "Thrash & Metal",
  "manifest_version": 2,
  "description": "some metal and thrash groups .."
}