Examine source code of CoasyBlack

{
  "theme": {
    "images": {
      "theme_frame": "blackhead.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#c0c0c0"
    }
  },
  "version": "2.0",
  "name": "CoasyBlack",
  "manifest_version": 2,
  "description": "I hope i made good, eyes-friendly, dark design without any signs that used to disturb during browsing. Enjoy!"
}