Examine source code of Cardboardium

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_cardboardium.jpg"
    },
    "colors": {
      "frame": "#d1bda3",
      "tab_background_text": "#894e2a"
    }
  },
  "version": "2.0",
  "name": "Cardboardium",
  "manifest_version": 2,
  "description": "Cardboardium - is it a shipping remnant? A diorama cast-off? A miracle material? Whenever you need a quick fix, you always have Cardboardium and tape."
}