Examine source code of Dark Mode Orange

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Simple Orange",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(50, 54, 57)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(32, 33, 36)",
      "tab_background_text": "rgb(241, 243, 244)",
      "toolbar_field": "rgb(32, 33, 36)",
      "toolbar_field_text": "rgb(212, 213, 215)",
      "tab_line": "rgb(255, 140, 0)",
      "popup": "rgb(50, 54, 57)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(0, 0, 0)",
      "frame_inactive": "rgb(50, 54, 57)",
      "icons_attention": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 140, 0)"
    }
  }
}