Examine source code of Winters Eve

{
  "theme": {
    "images": {
      "theme_frame": "WintersEveHdr.jpg"
    },
    "colors": {
      "frame": "#116f82",
      "tab_background_text": "#a80909"
    }
  },
  "version": "2.0",
  "name": "Winters Eve",
  "manifest_version": 2,
  "description": "Netherlands Countryside in late winter / early spring"
}