Examine source code of zerolf

{
  "theme": {
    "images": {
      "theme_frame": "fondocorreo2.jpg"
    },
    "colors": {
      "frame": "#452b2b",
      "tab_background_text": "#6d8fde"
    }
  },
  "version": "2.0",
  "name": "zerolf",
  "manifest_version": 2,
  "description": "zerolf"
}