The following is taken from the Netscape Handbook Bookmarks The Bookmarks menu provides fast and easy access to your favorite pages. Initially, the menu displays only the two items that help you add and modify pages in a bookmark list. Selecting the title brings the page to your screen.
Bookmarks are maintained in lists, each list is represented by a bookmarks file.
You can maintain multiple bookmark lists, each with its own set of titles linked to favorite pages, though only one bookmark list can be active at a time. The menu item View Bookmarks produces a Bookmark List dialog box offering options that allow you to build and maintain one or more bookmark files. You can organize and customize items in the Bookmarks menu through the Bookmark List dialog box. Bookmark menu items can be arranged hierarchically. An item indented one deep in the bookmark list appears as a submenu of the header in the menu.