Examine source code of Picnic Time

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_picnic.jpg"
    },
    "colors": {
      "frame": "#f76bc4",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Picnic Time",
  "manifest_version": 2,
  "description": "Just something I made for myself. Cute candy and fruit on a checkered background."
}