Bug 404658 - Drag and drop in Bookmarks Sidebar allows bookmarks to be place in top level ("/") folder above bookmarks menu (r=mano)

browser/components/places/content/utils.js

@@ -1156,6 +1156,9 @@ var PlacesUIUtils = {
                                                   "AllBookmarks", 0, EXPIRE_NEVER);
         self.leftPaneQueries["AllBookmarks"] = itemId;
 
+        // disallow manipulating this folder within the organizer UI
+        PlacesUtils.bookmarks.setFolderReadonly(allBookmarksId, true);
+
         // All Bookmarks->Bookmarks Toolbar Query
         uri = PlacesUtils._uri("place:folder=TOOLBAR");
         itemId = PlacesUtils.bookmarks.insertBookmark(allBookmarksId, uri, -1, null);