Examine source code of Dark_Blueprint

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#010203",
      "tab_background_text": "#898f8f"
    }
  },
  "version": "2.0",
  "name": "Dark_Blueprint",
  "manifest_version": 2,
  "description": "Dark blueprint based upon the classic blueprint but in black."
}