diff --git a/browser/base/content/browser-box.inc.xhtml b/browser/base/content/browser-box.inc.xhtml
index 7d7e8697f02f90d4f336c9ab0a73a89848e0c21c..d113b439888d26629ce5f6b5d35f8fa12249774b 100644
--- a/browser/base/content/browser-box.inc.xhtml
+++ b/browser/base/content/browser-box.inc.xhtml
@@ -23,7 +23,13 @@
     <browser id="sidebar" autoscroll="false" disablehistory="true" disablefullscreen="true" tooltip="aHTMLTooltip"/>
   </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-container"></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>