Examine source code of Skull Master

{
  "theme": {
    "images": {
      "theme_frame": "SkullyHeader.JPG"
    },
    "colors": {
      "frame": "#96e3eb",
      "tab_background_text": "#96e3eb"
    }
  },
  "version": "2.0",
  "name": "Skull Master",
  "manifest_version": 2,
  "description": "One of my many Halloween Decorations."
}