Examine source code of thejocker

{
  "theme": {
    "images": {
      "theme_frame": "Jockeremcabezado.png"
    },
    "colors": {
      "frame": "#2579c2",
      "tab_background_text": "#f8fc00"
    }
  },
  "version": "2.0",
  "name": "thejocker",
  "manifest_version": 2,
  "description": "a"
}