Examine source code of macOS Safari Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "macOS Safari Dark",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(30, 30, 30)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(30, 30, 30)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(17, 17, 17)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(17, 17, 17)",
      "popup": "rgb(40, 40, 40)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(47, 47, 47)",
      "ntp_background": "rgb(40, 40, 40)",
      "ntp_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 255, 255)",
      "tab_selected": "rgb(16, 16, 16)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgb(40, 40, 40)",
      "toolbar_field_border": "rgb(17, 17, 17)",
      "toolbar_field_focus": "rgb(40, 40, 40)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(63, 99, 139)",
      "toolbar_field_separator": "rgb(30, 30, 30)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(30, 30, 30)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8ce6ac0a-5481-4fe9-aafd-0933bda6b61b}"
    }
  }
}