Examine source code of Oldtime school

{
  "theme": {
    "images": {
      "theme_frame": "header2b.png"
    },
    "colors": {
      "frame": "#f5d63d",
      "tab_background_text": "#f2df9b"
    }
  },
  "version": "2.0",
  "name": "Oldtime school",
  "manifest_version": 2,
  "description": "Oldschool reminds me of my childhood. From a distance , ist was not too bad"
}