Examine source code of Feyenoord simple white

{
  "theme": {
    "images": {
      "theme_frame": "headerfs01.jpg"
    },
    "colors": {
      "frame": "#4a3232",
      "tab_background_text": "#363636"
    }
  },
  "version": "2.0",
  "name": "Feyenoord simple white",
  "manifest_version": 2,
  "description": "Feyenoord (soccer club in Rotterdam) simple white background."
}