diff --git a/browser/base/content/browser.xhtml b/browser/base/content/browser.xhtml
index b4886fb5f74568b4c09eb620be9efb74e39c599c..b4a6bb5e06db8b097457c490d369ad9e2ae66454 100644
--- a/browser/base/content/browser.xhtml
+++ b/browser/base/content/browser.xhtml
@@ -165,7 +165,10 @@
 
 #include navigator-toolbox.inc.xhtml
 
-#include browser-box.inc.xhtml
+  <hbox flex="1">
+    #include zen-sidebar-box.inc.xhtml
+    #include browser-box.inc.xhtml    
+  </hbox>
 
   <html:template id="customizationPanel">
     <box id="customization-container" flex="1" hidden="true"><![CDATA[