Hello, In Android Firefox support only the basic bookmarking of sites and does not include any option to sort/organize the bookmarks or to group them into folders natively. If you need to organize your mobile bookmarks use Firefox Sync to connect Firefox for Android and Firefox Desktop. Using the Desktop Firefox bookmark management you will be able to arrange mobile bookmarks https://support.mozilla.org/en-US/kb/firefox-sync-take-your-bookmarks-and-tabs-with-you cheers