This is still an issue for me. I installed the del.icio.us extension, and then removed all of my bookmark toolbar items, Right-clicked the toolbar, selected Customize, and removed the Bookmarks Toolbar item. I also right-clicked and uncheck the Bookmark Toolbar. It appears on an FF restart in Feisty's Firefox 2.0.0.3.
This is still an issue for me. I installed the del.icio.us extension, and then removed all of my bookmark toolbar items, Right-clicked the toolbar, selected Customize, and removed the Bookmarks Toolbar item. I also right-clicked and uncheck the Bookmark Toolbar. It appears on an FF restart in Feisty's Firefox 2.0.0.3.