Examine source code of William plus Kate

{
  "theme": {
    "images": {
      "theme_frame": "WillKate.png"
    },
    "colors": {
      "frame": "#4014de",
      "tab_background_text": "#4014de"
    }
  },
  "version": "2.0",
  "name": "William plus Kate",
  "manifest_version": 2,
  "description": "The newest royal couple."
}