diff -r 6b3d5ee8d6a7 browser/base/content/browser.js
--- a/browser/base/content/browser.js	Fri Aug 08 13:13:41 2008 -0700
+++ b/browser/base/content/browser.js	Sat Aug 09 09:27:08 2008 -0400
@@ -61,6 +61,7 @@ let Ci = Components.interfaces;
 let Ci = Components.interfaces;
 let Cu = Components.utils;
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/SpatialNavigation.js");
 
 const nsIWebNavigation = Components.interfaces.nsIWebNavigation;
 
@@ -915,6 +916,9 @@ function prepareForStartup()
 
   // setup our common DOMLinkAdded listener
   gBrowser.addEventListener("DOMLinkAdded", DOMLinkHandler, false);
+
+  // add spatial nav
+  SpatialNavigation.init(gBrowser);
 }
 
 function delayedStartup()