"Views -> Sort" is only for viewing purposes in the Library (similar to clicking a column on the header bar), it doesn't actually sort bookmarks. You can only sort bookmarks in a folder if you right-click this folder. *https://support.mozilla.org/en-US/kb/sort-bookmarks-quickly-find-ones-you-want *https://addons.mozilla.org/firefox/addon/auto-sort-bookmarks/ If the bookmarks get sorted in places other than the Views menu in the Library then you likely have an extension causing this. *https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems The sorting in a 'recent' type list is always sort by time with the newest on top as this is the result of a query.