{
  username,
  lib,
  config,
  ...
}: {
  config = lib.mkIf config.firefox.enable {
    home-manager.users.${username} = {
      programs.firefox = {
        profiles.${username} = {
          userChrome = ''
            #alltabs-button { display: none !important; }
            @namespace xul "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";

            :root {
                --background: #1d2021;
                --secondary: #282828;
                --foreground: #EBDBB2;
                --orange-highlight: #fe8019;
                --sound-border: #68217A;
                --separator: #665e54;
                --toolbar-bgcolor: var(--secondary) !important;
                --tab: var(--background);
                --tab-btn: var(--tab-inactive);
                --tab-inactive: var(--secondary);
                --tab-btn-inactive: var(--tab-inactive);
                --tab-hover: #32302f;
                --tab-btn-hover: #3C3836;
                --toolbar-btn-hover: #49463f;
                --url-bar: #3C3836; /* Updated color */
                --url-focus: #3C3836;
                --url-bar-item-hover: #6a6257;
                --sidebar: #3C3836;
                --sidebar-button-hover: #5A544B;
                --sidebar-highlight: #458588;
            }

            .titlebar-buttonbox-container {
                display: none !important;
            }

            .panel-arrowcontainer {
                background-color: var(--secondary) !important;
            }

            #PopupAutoComplete,
            #PopupSearchAutoComplete {
                background-color: var(--url-focus) !important;
                color: var(--foreground) !important;
            }

            panelview {
                background-color: var(--sidebar) !important;
                color: var(--foreground) !important;
            }

            panel[type="autocomplete-richlistbox"] {
                --panel-background: none !important;
                border-radius: 4px !important;
                color: var(--foreground) !important;
            }

            toolbarseparator,
            menuseparator {
                border-color: var(--separator) !important;
                border-image: none !important;
            }

            toolbar {
                background-color: var(--secondary);
            }

            toolbar#TabsToolbar {
                background-color: var(--background);
            }

            toolbar#TabsToolbar:-moz-window-inactive {
                background-color: var(--toolbar-bgcolor) !important;
            }

            #titlebar,
            #titlebar-spacer,
            #titlebar-buttonbox-container {
                background-color: var(--background) !important;
                border: none !important;
            }

            #navigator-toolbox {
                --tabs-border-color: var(--orange-highlight) !important;
            }

            #navigator-toolbox::after {
                border-bottom: 0px !important;
            }

            #navigator-toolbox {
                border: none !important;
            }

            #urlbar,
            #searchbar {
                box-shadow: none !important;
                border: none !important;
                border-radius: 4px;
                color: var(--foreground) !important;
                background-color: var(--url-bar) !important;
                --autocomplete-popup-separator-color: var(--separator) !important;
            }

            #urlbar-input,
            #urlbar-input-container {
                color: var(--foreground) !important;
                background-color: var(--url-bar) !important;
            }

            #urlbar:not([open]) #urlbar-input-container:focus-within,
            #searchbar:focus-within {
                border: 2px solid var(--orange-highlight) !important;
            }

            #urlbar:focus-within,
            #urlbar[open],
            #urlbar[open] #urlbar-input-container,
            #urlbar[open] #urlbar-input,
            #urlbar-input-container:focus-within,
            #urlbar-input:focus,
            #urlbar-background,
            .urlbarView,
            #searchbar:focus-within,
            menupop {
                background-color: var(--url-focus) !important;
            }

            #searchbar:focus-within {
                outline: none !important;
            }

            :is(panel, menupopup)::part(content) {
                background: none !important;
            }

            .urlbarView button:hover,
            #searchbar button:hover,
            .urlbarView-row:hover .urlbarView-row-inner,
            .search-autocomplete-richlistbox-popup .autocomplete-richlistitem:hover {
                background-color: var(--url-bar-item-hover) !important;
            }

            .urlbarView-row[type="switchtab"] > span {
                color: var(--orange-highlight) !important;
            }

            #PopupSearchAutoComplete .autocomplete-richlistitem[selected],
            .searchbar-engine-one-off-item[selected],
            .urlbarView-row[selected],
            .urlbarView-row[aria-selected="true"],
            .urlbarView-row:not([type="tip"], [type="dynamic"])[selected] > .urlbarView-row-inner,
            .urlbarView-row-inner[selected] {
                color: var(--foreground) !important;
                background-color: var(--sidebar-highlight) !important;
                border-radius: 4px !important;
            }

            #PersonalToolbar {
                background-color: var(--secondary) !important;
            }

            .tab-background[selected="true"] {
                background-color: transparent !important;
                background-image: none !important;
            }

            .tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected="true"]):not([multiselected]) {
                background-color: transparent !important;
            }

            .tabbrowser-tab[soundplaying="true"] {
                --lwt-tab-line-color: var(--sound-border) !important;
            }

            .tab-content[selected="true"] {
                border-color: var(--orange-highlight) !important;
                --sound-border: var(--orange-highlight) !important;
            }

            .tab-text {
                color: var(--foreground);
            }

            tab,
            #tabbrowser-tabs {
                background-color: var(--background) !important;
                color: var(--foreground) !important;
            }

            tab:-moz-window-inactive,
            #tabbrowser-tabs:-moz-window-inactive,
            #nav-bar-customization-target {
                background-color: var(--secondary) !important;
            }

            .tabbrowser-tab[selected] {
                opacity: 1;
            }

            .tab-loading-burst {
                background-color: inherit;
            }

            .tab-content {
                border-radius: 4px;
                margin: 5px 0px 5px 0px !important;
                border: 1px solid transparent !important;
            }

            .tab-content[selected="true"] {
                background-color: var(--secondary) !important;
                color: var(--foreground) !important;
                border: 1px solid var(--orange-highlight) !important;
            }

            .tab-content:not([selected="true"]):hover {
                background-color: var(--tab-hover) !important;
            }

            toolbarbutton {
                fill: var(--foreground) !important;
                background-color: transparent !important;
            }

            #TabsToolbar toolbarbutton {
                border-radius: 4px;
                border: 1px solid transparent !important;
            }

            #alltabs-button > .toolbarbutton-badge-stack,
            #tabs-newtab-button > .toolbarbutton-icon {
                background-image: none;
                border-radius: 6px;
            }

            #alltabs-button:hover > .toolbarbutton-badge-stack,
            #tabs-newtab-button:hover > .toolbarbutton-icon {
                background-color: var(--tab-btn-hover) !important;
            }

            #TabsToolbar #firefox-view-button > .toolbarbutton-icon {
                background-image: none !important;
                border-radius: 4px;
            }

            #TabsToolbar #firefox-view-button[open] > .toolbarbutton-icon {
                background-color: var(--secondary) !important;
                color: var(--foreground) !important;
                padding: 9px !important;
                border: 1px solid var(--orange-highlight) !important;
            }

            #TabsToolbar #firefox-view-button:not([open]):hover > .toolbarbutton-icon {
                background-color: var(--tab-hover) !important;
            }

            #nav-bar toolbarbutton > .toolbarbutton-icon,
            #nav-bar toolbarbutton > .toolbarbutton-badge-stack {
                border-radius: 6px;
            }

            #nav-bar toolbarbutton:hover > .toolbarbutton-icon,
            #nav-bar toolbarbutton:hover > .toolbarbutton-badge-stack {
                background-color: var(--toolbar-btn-hover) !important;
            }

            #back-button {
                padding-right: 2px !important;
                padding-left: 2px !important;
                margin-left: 6px !important;
            }

            #PanelUI-menu-button {
                background-color: var(--secondary) !important;
                padding-right: 2px !important;
                margin-right: 6px !important;
            }

            #PersonalToolbar toolbarbutton {
                margin: 3px 0px 3px 3px !important;
                border-radius: 4px;
            }

            #PersonalToolbar toolbarbutton:hover {
                background-color: var(--toolbar-btn-hover) !important;
            }
            hbox.titlebar-spacer {
              display: none !important;
            }



          '';
        };
      };
    };
  };
}