Index: wikibits.js
===================================================================
--- wikibits.js	(revision 16049)
+++ wikibits.js	(working copy)
@@ -366,10 +366,10 @@
 	if (!document.selection && textbox.selectionStart == null)
 		return false;
 	
-	for (var i in mwEditButtons) {
+	for (var i = 0; i < mwEditButtons.length; i++) {
 		mwInsertEditButton(toolbar, mwEditButtons[i]);
 	}
-	for (var i in mwCustomEditButtons) {
+	for (var i = 0; i < mwCustomEditButtons.length; i++) {
 		mwInsertEditButton(toolbar, mwCustomEditButtons[i]);
 	}
 	return true;