Examine source code of Winter Persona 2

{
  "theme": {
    "images": {
      "theme_frame": "snow2.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffe600"
    }
  },
  "version": "2.0",
  "name": "Winter Persona 2",
  "manifest_version": 2,
  "description": "Ready for the cold season? Be prepared! You can't call it a good winter without a winter persona! So what are you waiting for? Have a try!"
}