Examine source code of Nirvana Silhouette

{
  "theme": {
    "images": {
      "theme_frame": "Nirvanaheader.png"
    },
    "colors": {
      "frame": "#0f0f0f",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Nirvana Silhouette",
  "manifest_version": 2,
  "description": "Nirvana persona. Gold on black colour scheme, featuring Kurt Cobain and Nirvana logo.\nI DO NOT own the images used in this persona, only the design."
}