Can you open the Bookmarks Manager? You can find "Show your bookmarks" in the drop-down list that opens if you click the star on the location/address bar and "Show All Bookmarks" in the Bookmarks menu. You should find a "New Folder" item in the Organize menu. That is the first button on the toolbar in the Bookmarks Manager (Library). *https://support.mozilla.org/kb/how-do-i-use-bookmarks *https://support.mozilla.org/kb/bookmark-folders-organize-your-bookmarks There are three main Bookmarks folders and bookmarks can only be created in one of those folders and its sub folders. * The "Bookmarks Toolbar" folder stores the bookmarks that you see on the Bookmarks Toolbar (Firefox > Options or View > Toolbars). * The "Bookmarks Menu" folder stores bookmarks that show in the Bookmarks menu and are created via "Bookmarks > Bookmark This Page" or via "Bookmark This Link" in the right-click context menu. * The "Unsorted Bookmarks" folder stores bookmarks that are created by clicking the star at the right end of the location bar.