diff --git a/chrome/content/zotero/standalone/standalone.js b/chrome/content/zotero/standalone/standalone.js
index 6fac21621..1c9bea03a 100644
--- a/chrome/content/zotero/standalone/standalone.js
+++ b/chrome/content/zotero/standalone/standalone.js
@@ -103,8 +103,9 @@ const ZoteroStandalone = new function() {
 			for (var i = 0; i<itemTypes.length; i++) {
 				var menuitem = document.createElement("menuitem");
 				menuitem.setAttribute("label", itemTypes[i].localized);
-				menuitem.setAttribute("oncommand","ZoteroPane_Local.newItem("+itemTypes[i]['id']+")");
 				menuitem.setAttribute("tooltiptext", "");
+				let type = itemTypes[i].id;
+				menuitem.addEventListener("command", function() { ZoteroPane_Local.newItem(type); }, false);
 				menuitem.className = "zotero-tb-add";
 				addMenu.appendChild(menuitem);
 			}
diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index a41c6b57b..f76d62855 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -274,8 +274,9 @@ var ZoteroPane = new function()
 		for (var i = 0; i<itemTypes.length; i++) {
 			var menuitem = document.createElement("menuitem");
 			menuitem.setAttribute("label", itemTypes[i].localized);
-			menuitem.setAttribute("oncommand","ZoteroPane_Local.newItem("+itemTypes[i]['id']+")");
 			menuitem.setAttribute("tooltiptext", "");
+			let type = itemTypes[i].id;
+			menuitem.addEventListener("command", function() { ZoteroPane_Local.newItem(type); }, false);
 			moreMenu.appendChild(menuitem);
 		}
 	}
@@ -311,8 +312,9 @@ var ZoteroPane = new function()
 		for (var i = 0; i<itemTypes.length; i++) {
 			var menuitem = document.createElement("menuitem");
 			menuitem.setAttribute("label", itemTypes[i].localized);
-			menuitem.setAttribute("oncommand","ZoteroPane_Local.newItem("+itemTypes[i]['id']+")");
 			menuitem.setAttribute("tooltiptext", "");
+			let type = itemTypes[i].id;
+			menuitem.addEventListener("command", function() { ZoteroPane_Local.newItem(type); }, false);
 			menuitem.className = "zotero-tb-add";
 			addMenu.insertBefore(menuitem, separator);
 		}
diff --git a/chrome/content/zotero/zoteroPane.xul b/chrome/content/zotero/zoteroPane.xul
index 36c90a9d3..67de5a7e3 100644
--- a/chrome/content/zotero/zoteroPane.xul
+++ b/chrome/content/zotero/zoteroPane.xul
@@ -38,7 +38,7 @@
 	xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
 	
 	<script src="include.js"/>
-	<script src="zoteroPane.js"/>
+	<script src="zoteroPane.js" type="application/javascript;version=1.8"/>
     <script src="fileInterface.js"/>
 	<script src="reportInterface.js"/>
 	<script src="timelineInterface.js"/>