New file

chrome/dark_popups_and_menus.css

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+/* Makes popups, menus and context menus dark */
+:root{
+  --uc-dark-bkgnd-color: rgb(12,16,32);
+  --uc-light-bkgnd-color: rgb(46,54,69);
+  --uc-active-color: rgb(26, 70, 102);
+  --uc-text-color: rgb(195, 198, 201);
+  --uc-border-color: rgb(43,130,191);
+}
+
+.panel-arrowcontent,
+#alltabs-popup .arrowscrollbox-scrollbox,
+
+menupopup:not(#BMB_bookmarksPopup),
+.textbox-contextmenu{
+	border: 3px solid #434850 !important;
+	background: var(--uc-dark-bkgnd-color) !important;
+	border-radius: 5px !important;
+	color: var(--uc-text-color) !important;
+}
+
+/* bookmarks menu is different from others */
+#BMB_bookmarksPopup{
+  background-color: unset !important;
+}
+/* GENERAL */
+menupopup,
+menuitem,
+menu{
+	-moz-appearance: none !important;
+}
+
+menupopup{
+  background-color:var(--uc-dark-bkgnd-color) !important; 
+  border:none;
+}
+
+menuitem,
+menu{
+	min-height:24px !important;
+  color: var(--uc-text-color) !important;
+}
+
+menuitem[disabled="true"],
+menu[disabled="true"]{
+  color: black !important;
+  text-shadow: 0 0 4px silver !important;
+}
+
+menuitem:hover,
+menu:hover{
+  background-color:var(--uc-active-color) !important;
+}
+
+menuitem[disabled="true"]:hover,
+menu[disabled="true"]:hover{
+  background-color: transparent !important;
+}
+
+.menu-right{ filter: invert(100%) }
+#context-navigation{ background-color: transparent !important; }
+
+/* POPUP PANELS */
+
+.panel-subviews,
+#mainPopupSet menupopup,
+#main-menubar menupopup,
+#bookmarks-menu-button menu menupopup > hbox,
+.search-panel-header.search-panel-current-engine,
+.search-panel-current-input,
+panelview,
+.PanelUI-subView,
+.autocomplete-richlistbox{
+   background-color:  var(--uc-dark-bkgnd-color) !important;
+}
+
+.subviewbutton:hover{
+  background-color: var(--uc-active-color) !important;
+}
+
+panelview toolbarbutton.subviewbutton .toolbarbutton-text,
+#downloadsFooter,
+#customizationui-widget-panel label,
+.autocomplete-richlistitem .ac-title,
+#widget-overflow-list toolbarbutton,
+#bookmarks-menu-button menu menupopup,
+#PopupSearchAutoComplete .autocomplete-tree.plain.search-panel-tree,
+#PanelUI-contents toolbarbutton,
+#sidebar-switcher-target,
+#alltabs_containersTab{
+    color: var(--uc-text-color)!important;
+}
+
+#alltabs-popup,
+#alltabs_containersMenuTab{
+  border: none !important;
+}
+
+/* URLBAR AND SEARCHBAR POPUPS */
+
+#PopupAutoCompleteRichResult .ac-title,
+#PopupAutoCompleteRichResult .search-one-offs,
+.search-panel-input-value{
+	color: var(--uc-text-color) !important;
+}
+
+.search-panel-one-offs,
+.downloadsPanelFooterButton:not(:hover),
+#overflowMenu-customize-button:not(:hover),
+#searchbar-anon-search-settings{
+  background-color: var(--uc-light-bkgnd-color) !important;
+}
+
+#PopupAutoCompleteRichResult .ac-emphasize-text.ac-emphasize-text-title{
+	color: var(--uc-border-color) !important;
+}