diff --git a/chrome/tabs_on_bottom.css b/chrome/tabs_on_bottom.css
index 00a8a2c..e42af63 100644
--- a/chrome/tabs_on_bottom.css
+++ b/chrome/tabs_on_bottom.css
@@ -58,6 +58,14 @@ linux_gtk_window_control_patch.css
 
 @media (-moz-gtk-csd-close-button){ .titlebar-button{ -moz-box-orient: vertical } }
 
+/* At Activated Menubar */
+:root:not([chromehidden~="menubar"], [sizemode="fullscreen"]) #toolbar-menubar:not([autohide="true"]) + #TabsToolbar > .titlebar-buttonbox-container {
+  display: block !important;
+}
+:root:not([chromehidden~="menubar"]) #toolbar-menubar:not([autohide="true"]) .titlebar-buttonbox-container {
+  visibility: hidden;
+}
+
 /* These exist only for compatibility with autohide-tabstoolbar.css */
 toolbox#navigator-toolbox > toolbar#nav-bar.browser-toolbar{ animation: none; }
 #navigator-toolbox:hover #TabsToolbar{ animation: slidein ease-out 48ms 1 }
@@ -67,4 +75,4 @@ toolbox#navigator-toolbox > toolbar#nav-bar.browser-toolbar{ animation: none; }
 /* Uncomment the following if you want bookmarks toolbar to be below tabs */
 /*
 #PersonalToolbar{ -moz-box-ordinal-group: 2 }
-*/
\ No newline at end of file
+*/