diff --git a/chrome/round_ui_items.css b/chrome/round_ui_items.css
new file mode 100644
index 0000000..c7b99f8
--- /dev/null
+++ b/chrome/round_ui_items.css
@@ -0,0 +1,44 @@
+/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/round_ui_items.css made available under Mozilla Public License v. 2.0
+See the above repository for updates as well as full license text. */
+
+/* Make bunch of things in the main UI round */
+
+:root{ --toolbarbutton-border-radius: 24px !important }
+#urlbar-input-container > box:hover,
+#urlbar-input-container > box[open],
+#main-menubar >  menu,
+.titlebar-button:hover,
+#scrollbutton-up,
+#scrollbutton-down,
+.tab-close-button,
+.close-icon > image,
+#page-action-buttons > :hover,
+.panel-arrowcontent,
+.urlbarView-row-inner,
+.search-one-offs button,
+.subviewbutton-back,
+.toolbaritem-combined-buttons > toolbarbutton,
+#PopupSearchAutoComplete,
+menupopup{ border-radius: 18px }
+
+button,
+.tab-background{ border-radius: 30px !important; }
+
+.panel-arrowcontent{ margin-inline-end: 0 !important; }
+.panel-arrow{ margin-inline: 17px !important; }
+
+menupopup{ -moz-appearance: none !important; overflow: -moz-hidden-unscrollable !important; }
+
+.tabbrowser-tab[selected]::after,
+.tabbrowser-tab[beforeselected-visible]::after{ border-color: transparent !important; }
+
+#nav-bar{ box-shadow: none !important; margin-top: 3px }
+.tab-line{ display: none }
+
+.tab-background[selected]{ border-top-width: 2px !important; border-top-color: var(--tab-line-color) !important; }
+.tabbrowser-tab[selected]{ z-index: auto !important; }
+
+.urlbar-icon,
+toolbar toolbarbutton:not(#back-button):not(.bookmark-item):not(.titlebar-button) > .toolbarbutton-icon{  border-radius: 0px !important; clip-path: circle() }
+
+menugroup:hover > menuitem{ clip-path: circle() }
\ No newline at end of file
diff --git a/html_resources/tagmap.json b/html_resources/tagmap.json
index 40ce965..3123d94 100644
--- a/html_resources/tagmap.json
+++ b/html_resources/tagmap.json
@@ -105,5 +105,6 @@
 "vertical_context_navigation_v2.css":["navigation","menu","popup"],
 "vertical_menubar.css":["menubar","hack"],
 "vertical_popup_menubar.css":["menubar","menu","toolbars","popup"],
-"window_control_placeholder_support.css":["window-control","patch"]
+"window_control_placeholder_support.css":["window-control","patch"],
+"round_ui_items.css":["buttons","icon","menu","tabs","toolbars","bookmarks"]
 }
diff --git a/tags.csv b/tags.csv
index 902c16e..6a93da0 100644
--- a/tags.csv
+++ b/tags.csv
@@ -105,3 +105,4 @@ vertical_context_navigation_v2.css,navigation,menu,popup
 vertical_menubar.css,menubar,hack
 vertical_popup_menubar.css,menubar,menu,toolbars,popup
 window_control_placeholder_support.css,window-control,patch
+round_ui_items.css,buttons,icon,menu,tabs,toolbars,bookmarks