Bookmarked URL gets open in New tab, on pressing enter key for 'Folders' dropdown.

chrome/browser/resources/bookmark_manager/js/main.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function() {
 /** @const */ var BookmarkList = bmm.BookmarkList;
 /** @const */ var BookmarkTree = bmm.BookmarkTree;
 /** @const */ var Command = cr.ui.Command;
 /** @const */ var LinkKind = cr.LinkKind;
 /** @const */ var ListItem = cr.ui.ListItem;
@@ skipping 617 matching lines @@
     case 'cut-command':
       e.canExecute = canCopyItems() && canEdit &&
           !hasUnmodifiable(bmm.list.selectedItems);
       break;
 
     case 'copy-command':
       e.canExecute = canCopyItems();
       break;
 
     case 'open-in-same-window-command':
-      e.canExecute = hasSelected();
+      e.canExecute = (e.target == bmm.list) && hasSelected();
       break;
 
     default:
       canExecuteShared(e, isSearch());
   }
 }
 
 // Update canExecute for the commands when the list is the active element.
 function handleCanExecuteForList(e) {
   if (e.target != bmm.list) return;
@@ skipping 868 matching lines @@
 
   cr.ui.FocusOutlineManager.forDocument(document);
   initializeSplitter();
   bmm.addBookmarkModelListeners();
   dnd.init(selectItemsAfterUserAction);
   bmm.tree.reload();
 }
 
 initializeBookmarkManager();
 })();