Examine source code of A cool day in hell

{
  "theme": {
    "images": {
      "theme_frame": "Optimized-Heaven-and-hell-Banne3.png"
    },
    "colors": {
      "frame": "#c9a906",
      "tab_background_text": "#0e2169"
    }
  },
  "version": "2.0",
  "name": "A cool day in hell",
  "manifest_version": 2,
  "description": "A New look without the gate in the middle"
}