diff --git a/chrome/vertical_menubar.css b/chrome/vertical_menubar.css
index 9595e86..8d26391 100644
--- a/chrome/vertical_menubar.css
+++ b/chrome/vertical_menubar.css
@@ -4,15 +4,16 @@
 /* So, if you want the menu items to be toggleable, just move one button to be before menubar items in the toolbar. If all buttons come after menubar items, then none of those will trigger menubar items. */
 
 
-#titlebar{
-  position: fixed; 
+:root:not([customizing]) #titlebar{
+  position: fixed;
+  -moz-appearance: none !important;
   right: 0px; 
   height: 100vh;
   width: 30px;
 }
-#navigator-toolbox{ margin-top: var(--tab-min-height) }
+:root:not([customizing]) > #navigator-toolbox{ margin-top: var(--tab-min-height) }
 
-#TabsToolbar{
+#TabsToolbar:not([customizing]){
   position: fixed;
   top: 0px;
   left: 0px;
@@ -26,10 +27,11 @@
   float: right !important;
 }
 
-#toolbar-menubar{
+#toolbar-menubar:not([customizing]){
   margin-top: 40px;
   width: 30px;
   -moz-box-orient: vertical;
+  -moz-box-flex: 1;
 }
 
 #toolbar-menubar > .titlebar-buttonbox-container,#toolbar-menubar > spacer{ display: none !important; }
@@ -37,7 +39,7 @@
 #toolbar-menubar > #menubar-items{ visibility: collapse }
 #toolbar-menubar > .toolbarbutton-1:first-child:hover + #menubar-items,#toolbar-menubar > #menubar-items:hover{ visibility: visible }
 
-#main-menubar{
+#toolbar-menubar:not([customizing]) #main-menubar{
   -moz-box-orient: vertical;
   margin-left: -60px;
   background-color: var(--lwt-accent-color)