diff --git a/mozilla/xpfe/global/resources/content/globalOverlay.js b/mozilla/xpfe/global/resources/content/globalOverlay.js
index dcd8a817958..04e92d5606e 100644
--- a/mozilla/xpfe/global/resources/content/globalOverlay.js
+++ b/mozilla/xpfe/global/resources/content/globalOverlay.js
@@ -62,7 +62,7 @@ function goDoCommand(command)
 {
 	var controller = top.document.commandDispatcher.getControllerForCommand(command);
 
-	if ( controller )
+	if ( controller && controller.isCommandEnabled(command))
 		controller.doCommand(command);
 }