diff --git a/chrome/autohide_toolbox.css b/chrome/autohide_toolbox.css
index 4d022c1..c8bf99a 100644
--- a/chrome/autohide_toolbox.css
+++ b/chrome/autohide_toolbox.css
@@ -41,7 +41,7 @@ See the above repository for updates as well as full license text. */
   pointer-events: none;
 }
 
-#navigator-toolbox:hover{ transition-delay: 33ms !important }
+#navigator-toolbox:-moz-any(:hover,:focus-within){ transition-delay: 33ms !important }
 
 #navigator-toolbox > *{ line-height: normal; pointer-events: auto }