Examine source code of Red theme

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "Red theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "frame": "rgb(135, 20, 20)",
      "toolbar": "rgb(170, 5, 5)",
      "toolbar_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(105, 40, 40)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_text": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(210, 210, 210)",
      "tab_line": "rgb(245, 145, 145)",
      "tab_loading": "rgb(245, 145, 145)",
      "icons_attention": "rgb(255, 215, 0)",
      "popup": "rgb(170, 5, 5)",
      "popup_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgba(255, 255, 255, 0.1)",
      "sidebar": "rgb(45, 45, 45)",
      "ntp_background": "rgb(45, 45, 45)",
      "ntp_text": "rgb(255, 255, 255)",
      "ntp_card_background": "rgb(60, 60, 60)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cb80e5b0-bb23-4cfb-90e4-5764821588eb}"
    }
  }
}