Are you talking about Thunderbird eventually?

miketompkins said

firfox is not downloading messages through the dealt email keeps asking for the password. will not dowload new email messgs

Yes (thunderbird) isn not downloading messages is sat as default is ask for pass word will not download messages

If you haven't told Thunderbird to remember your account password, you'll be prompted for it when needed. That's nothing unusual. Check this article. https://support.mozilla.org/en-US/kb/cannot-receive-messages