Examine source code of Blackhole Space

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Blackhole Space",
  "manifest_version": 2,
  "description": "This is for folks who like something out of the ordinary.  A dark theme, yet has nice middle highlight to show all the tabs and text very well.  Enjoy the BlackHole !"
}