Examine source code of A Quiet nightmare

{
  "theme": {
    "images": {
      "theme_frame": "crows2header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#e80c0c"
    }
  },
  "version": "2.0",
  "name": "A Quiet nightmare",
  "manifest_version": 2,
  "description": "There's no noise but just silence. The place was filled with bright light without heat and uncountable black wings  fluttering."
}