Examine source code of Renacer..

{
  "theme": {
    "images": {
      "theme_frame": "halloween.jpg"
    },
    "colors": {
      "frame": "#087fff",
      "tab_background_text": "#031d52"
    }
  },
  "version": "2.0",
  "name": "Renacer..",
  "manifest_version": 2,
  "description": "ahora si!!! se ve completo :D"
}