You need to use "Sort by Name" in the right-click context menu of a bookmarks folder to sort this folder permanently. If you use "Views -> Sort" in the Bookmarks Manager (Library) then the bookmarks are only sorted while you are viewing them in the Library, this is the same as clicking on the column header. *https://support.mozilla.org/en-US/kb/sort-bookmarks-quickly-find-ones-you-want See also: *https://addons.mozilla.org/firefox/addon/auto-sort-bookmarks/