Examine source code of KATSUI

{
  "theme": {
    "images": {
      "theme_frame": "FIREFOXPersona6.jpg"
    },
    "colors": {
      "frame": "#3a14c7",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "KATSUI",
  "manifest_version": 2,
  "description": "Sinuous, bold lightform emulating a powerful wave or tsunami."
}