Maybe since you only need to sort for cleanup purposes, you could use the Library window. Here's how: Open the Library window using Ctrl+Shift+O (as in Organizer) or by clicking Manage Bookmarks at menu button > Bookmarks > Manage Bookmarks In the left column, click the folder you want to de-duplicate. On the right side, you should see the folder contents listed, and both a Name column (page title) and a Location column (URL). You can click a column heading to sort the current view by either of those to see whether you can spot duplicates that way. This method of sorting is just for the Library window and doesn't change the order of bookmarks in the folder.