Examine source code of princesses3

{
  "theme": {
    "images": {
      "theme_frame": "Untitled-1copy.jpg"
    },
    "colors": {
      "frame": "#0ee1e8",
      "tab_background_text": "#a5f20c"
    }
  },
  "version": "2.0",
  "name": "princesses3",
  "manifest_version": 2
}