diff --git a/chrome/Fx65_tabs_on_bottom.css b/chrome/Fx65_tabs_on_bottom.css
index 5de1ade..9746ab2 100644
--- a/chrome/Fx65_tabs_on_bottom.css
+++ b/chrome/Fx65_tabs_on_bottom.css
@@ -51,3 +51,7 @@ linux_gtk_window_control_patch.css
 #navigator-toolbox::after{ display: none !important; }
 
 @media (-moz-gtk-csd-close-button){ .titlebar-button{ -moz-box-orient: vertical } }
+
+/* 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 }