diff --git a/chrome/hide_tabs_with_one_tab.css b/chrome/hide_tabs_with_one_tab.css
index 589bfa4..28638d9 100644
--- a/chrome/hide_tabs_with_one_tab.css
+++ b/chrome/hide_tabs_with_one_tab.css
@@ -1,12 +1,11 @@
 /* Makes tabs toolbar items zero-height initially and sets enlarge them to fill up space equal to tab-min-height set on tabs */
 /* Firefox 65+ only */
 
-
 :root[sizemode="normal"] #nav-bar{ --uc-window-drag-space-width: 20px }
 
 #titlebar{ -moz-appearance: none !important; }
 
-#tabbrowser-tabs, #tabbrowser-tabs > .tabbrowser-arrowscrollbox{ min-height: 0 !important; }
+#tabbrowser-tabs, #tabbrowser-tabs > .tabbrowser-arrowscrollbox, #tabbrowser-arrowscrollbox{ min-height: 0 !important; }
 
 :root:not([customizing]) #tabbrowser-tabs .tabs-newtab-button,
 :root:not([customizing]) #tabs-newtab-button,
diff --git a/chrome/hide_tabs_with_one_tab_w_window_controls.css b/chrome/hide_tabs_with_one_tab_w_window_controls.css
index 059b4f5..832a5e8 100644
--- a/chrome/hide_tabs_with_one_tab_w_window_controls.css
+++ b/chrome/hide_tabs_with_one_tab_w_window_controls.css
@@ -11,7 +11,7 @@ Window controls will be all wrong without it
 #titlebar{ -moz-appearance: none !important; }
 /* We'll use window controls from menubar instead */
 #TabsToolbar > .titlebar-buttonbox-container { display: none }
-#tabbrowser-tabs, #tabbrowser-tabs > .tabbrowser-arrowscrollbox{ min-height: 0 !important; }
+#tabbrowser-tabs, #tabbrowser-tabs > .tabbrowser-arrowscrollbox, #tabbrowser-arrowscrollbox{ min-height: 0 !important; }
 
 #TabsToolbar > .titlebar-spacer[type="post-tabs"]{ width: 178px !important; }
 #toolbar-menubar > spacer{ pointer-events: none }