--- a/browser/components/places/content/placesOverlay.xul
+++ b/browser/components/places/content/placesOverlay.xul
@@ -20,21 +20,21 @@
   <script type="application/javascript"><![CDATA[
     ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
     ChromeUtils.defineModuleGetter(window,
       "PlacesUtils", "resource://gre/modules/PlacesUtils.jsm");
     ChromeUtils.defineModuleGetter(window,
       "PlacesUIUtils", "resource:///modules/PlacesUIUtils.jsm");
     ChromeUtils.defineModuleGetter(window,
       "PlacesTransactions", "resource://gre/modules/PlacesTransactions.jsm");
+    XPCOMUtils.defineLazyScriptGetter(window, "PlacesTreeView",
+      "chrome://browser/content/places/treeView.js");
   ]]></script>
   <script type="application/javascript"
           src="chrome://browser/content/places/controller.js"/>
-  <script type="application/javascript"
-          src="chrome://browser/content/places/treeView.js"/>
 
   <!-- Bookmarks and history tooltip -->
   <tooltip id="bhTooltip" noautohide="true"
            onpopupshowing="return window.top.BookmarksEventHandler.fillInBHTooltip(document, event)">
     <vbox id="bhTooltipTextBox" flex="1">
       <label id="bhtTitleText" class="tooltip-label" />
       <label id="bhtUrlText" crop="center" class="tooltip-label uri-element" />
     </vbox>