diff -urN comm-release-orig/suite/common/utilityOverlay.js comm-release/suite/common/utilityOverlay.js
--- comm-release-orig/suite/common/utilityOverlay.js	2014-09-05 14:30:38 +0900
+++ comm-release/suite/common/utilityOverlay.js	2014-09-09 11:14:34 +0900
@@ -1503,10 +1503,6 @@
 
   var loadInBackground = GetBoolPref("browser.tabs.loadInBackground", false);
 
-  // reuse the browser if its current tab is empty
-  if (isBrowserEmpty(w.getBrowser()))
-    where = "current";
-
   switch (where) {
   case "current":
     w.loadURI(url, aReferrerURI, aPostData, aAllowThirdPartyFixup, aIsUTF8);