--- a/devtools/client/framework/toolbox-window.xul
+++ b/devtools/client/framework/toolbox-window.xul
@@ -37,10 +37,11 @@
          modifiers="accel,alt"
          disabled="true"/>
     <key id="toolbox-key-toggle-F12"
          keycode="&toggleToolboxF12.keycode;"
          keytext="&toggleToolboxF12.keytext;"
          command="toolbox-cmd-close"/>
   </keyset>
 
-  <iframe id="toolbox-iframe" flex="1" forceOwnRefreshDriver=""></iframe>
+  <tooltip id="aHTMLTooltip" page="true"/>
+  <iframe id="toolbox-iframe" flex="1" forceOwnRefreshDriver="" tooltip="aHTMLTooltip"></iframe>
 </window>