Examine source code of VOID - Black

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Void - Black",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(12, 12, 13)",
      "toolbar_text": "rgb(249, 249, 250)",
      "frame": "rgb(12, 12, 13)",
      "tab_background_text": "rgb(249, 249, 250)",
      "toolbar_field": "rgb(12, 12, 13)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(12, 12, 13)",
      "popup": "rgb(12, 12, 13)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(12, 12, 13)",
      "button_background_hover": "rgb(12, 12, 13)",
      "ntp_background": "rgb(12, 12, 13)",
      "tab_selected": "rgb(12, 12, 13)",
      "tab_loading": "rgb(12, 12, 13)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5c0a9911-2d96-4f13-a0b1-50074bbd5af3}"
    }
  }
}