Examine source code of Demonical

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#3f0f7a",
      "tab_background_text": "#ffd900"
    }
  },
  "version": "2.0",
  "name": "Demonical",
  "manifest_version": 2,
  "description": "A theme based on my game, Demonical, sprites used to make a dark, mellow theme."
}