When I move to a new laptop will I lose all my bookmarks?

Yes you will loose those data unless you back or import them to file, or USB drive to restore them back. https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles https://support.mozilla.org/en-US/kb/export-login-data-firefox https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer Also Sync isn't a backup system so don't use it as such.