diff --git a/browser/base/content/browser-box.inc.xhtml b/browser/base/content/browser-box.inc.xhtml
index afa7f8e7dd74173bf2c696bd96f7e86e8b0126bc..4847c24923f673e91eb7fb65ea6b037f38062405 100644
--- a/browser/base/content/browser-box.inc.xhtml
+++ b/browser/base/content/browser-box.inc.xhtml
@@ -25,7 +25,15 @@
     </stack>
   </vbox>
   <splitter id="sidebar-splitter" class="chromeclass-extrachrome sidebar-splitter" resizebefore="sibling" resizeafter="none" hidden="true"/>
+<vbox flex="1" id="zen-appcontent-wrapper">
+  <html:div id="zen-appcontent-navbar-wrapper">
+    <html:div id="zen-appcontent-navbar-container"></html:div>
+  </html:div>
+  <hbox id="zen-tabbox-wrapper" flex="1">
   <tabbox id="tabbrowser-tabbox" flex="1" tabcontainer="tabbrowser-tabs">
+#include zen-tabbrowser-elements.inc.xhtml
     <tabpanels id="tabbrowser-tabpanels" flex="1" selectedIndex="0"/>
   </tabbox>
 </hbox>
+</vbox>
+</hbox>