Examine source code of Campos de Castilla

{
  "theme": {
    "images": {
      "theme_frame": "camposdecastillaencb.jpg"
    },
    "colors": {
      "frame": "#4f3517",
      "tab_background_text": "#4f3517"
    }
  },
  "version": "2.0",
  "name": "Campos de Castilla",
  "manifest_version": 2,
  "description": "Campos de Castilla"
}