fzdefaults.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<FileZilla3>
  <Settings>
    <Setting name="Config Location">$FILEZILLA_PORTABLE_SETTINGS</Setting>
    <Setting name="Disable update check">1</Setting>
    <Setting name="Cache directory">$FILEZILLA_PORTABLE_CACHE</Setting>
  </Settings>
</FileZilla3>