how do I set the current pages to be the startup

Hi This support article should help: https://support.mozilla.org/en-US/kb/how-do-i-restore-my-tabs-last-time#w_restore-the-previous-session-every-time-you-open-firefox

If you're looking for support.mozilla.org/en-US/kb/how-to-set-the-home-page#w_set-multiple-pages-as-your-home-page there's the "Use Current Pages" button under the custom URL panel.