Hi there, Thank you for your question, I understand that you would like to be able to upload bookmarks to your mobile device with Firefox on it. It really depends what the file format is. For desktop: [[Bookmarks in Firefox]] The tips and tricks section has all of the links to restoring or backing up. For mobile: you may need an add on or third party [https://tunesgo.wondershare.com/android/backup-android-bookmarks.html] *[https://addons.mozilla.org/en-US/android/collections/mozilla/bookmark-managers/] If it is both, you may have some luck with Firefox Sync: https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer?redirectlocale=en-US&redirectslug=how-do-i-set-up-firefox-sync