small perf opt.

browser/base/content/browser.js

@@ -382,11 +382,14 @@ function Startup()
 
   // Focus the content area unless we're loading a blank page
   var elt;      
+  if (uriToLoad == "about:blank") {
     var navBar = document.getElementById("nav-bar");
-  if (uriToLoad == "about:blank" && navBar && !navBar.hidden && gURLBar && !gURLBar.parentNode.parentNode.collapsed)
+    if (navBar && !navBar.hidden && gURLBar && !gURLBar.parentNode.parentNode.collapsed)
       elt = gURLBar;
-  else
+  }  
+  else {
     elt = _content;
+  }
   
   setTimeout(delayedStartup, 0, elt);
 }