You can't do that directly. "Most Visited" and "Recently Bookmarked" are examples of the so called [[Smart Bookmarks folders]] and are not real existing folders.<br /> Such smart folders show a list created by a query of the places.sqlite database that stores the bookmarks and the history in Firefox 3.<br /> The bookmarks that show up in such smart folder listing are stored elsewhere in another folder and any changes made are applied to the real bookmark or history item.<br /> Such lists show a maximum of 10 entries by default and you add a new bookmark or visit a website then a new item is added at the top and the entry at the bottom disappears from that list.<br /> You will have to use such a bookmark often enough to increase the visit count that it appears in that folder.<br /> You can make the Visit Count column visible in the Bookmarks Manager (Views > Show Columns)