Some information about so called smart bookmarks folders: * "Most Visited" and "Recently Bookmarked" and "Recent Tags" are examples of so called [[Smart Bookmarks folders|Smart Bookmarks folders]] and are not real existing folders. * Smart folders show a list created by a query of the places.sqlite database that stores bookmarks and history in Firefox. * Smart folder lists show a maximum of 10 entries by default. * Bookmarks and history items that show up in a smart folder list are stored elsewhere in another folder and any changes made are applied to the real bookmark or history item. * If you remove an entry then the list is shifted up and a new entry that wasn't shown previously is added to show 10 entries. * If 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. * Items that disappear from the list are not gone, but merely do not show up anymore in that list. * Actions like copy & paste or delete that you perform on bookmarks in such a list are done on the original bookmark. * If you do not want a specific list then remove that query (right-click: Delete), but do not delete the content that is displayed in such a list.