Supplementary patch to bug 203960 to fix javascript error: tabs is not defined when replacing bookmark groups spotted by hj p=gautheri@noos.fr r=me sr/a=brendan

xpfe/global/resources/content/bindings/tabbrowser.xml

@@ -1210,7 +1210,7 @@
           } else {
             this.backBrowserGroup = this.replaceGroup(aGroup);
             this.forwardBrowserGroup = [];
-            tab = tabs.firstChild;
+            tab = this.mTabContainer.firstChild;
           }
           return tab;
         ]]>