Examine source code of XFCE-Adwaita-Dark

{
  "manifest_version": 2,
  "version": "0.4",
  "name": "XFCE-Adwaita-Dark",
  "theme": {
    "properties": {
      "color_scheme": "dark",
      "panel_active": "color-mix(in srgb, currentColor 14%, transparent)",
      "toolbar_field_icon_opacity": "0",
      "zap_gradient": "linear-gradient(90deg, #9059FF 0%, #FF4AA2 52.08%, #FFBD4F 100%)"
    },
    "colors": {
      "frame": "rgb(53, 53, 53)",
      "toolbar": "rgb(40, 40, 40)",
      "toolbar_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(28,27,34)",
      "toolbar_field_border_focus": "rgb(21, 83, 158)",
      "toolbar_field_text": "white",
      "toolbar_field_text_focus": "rgb(252, 252, 252)",
      "toolbar_field_highlight": "rgb(21, 83, 158)",
      "toolbar_field_highlight_text": "white",
      "toolbar_vertical_separator": "rgb(21, 83, 158)",
      "toolbar_top_separator": "transparent",
      "toolbar_bottom_separator": "hsl(240, 5%, 5%)",
      "tab_background_text": "#fbfbfe",
      "tab_background_separator": "rgb(21, 83, 158)",
      "tab_line": "transparent",
      "tab_loading": "rgb(21, 83, 158)",
      "popup": "rgb(28,27,34)",
      "popup_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(27, 34, 36)",
      "popup_highlight": "rgb(40, 40, 40)",
      "ntp_background": "rgb(18, 18, 18)",
      "ntp_card_background": "rgb(40, 40, 40)",
      "button_background_active": "rgb(21, 83, 158)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4a3f2eaa-fcfe-4e89-a6ce-48c3fafeb65a}"
    }
  }
}