Examine source code of Frozen Ferns

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_frost.jpg"
    },
    "colors": {
      "frame": "#1c3559",
      "tab_background_text": "#faef8e"
    }
  },
  "version": "2.0",
  "name": "Frozen Ferns",
  "manifest_version": 2
}