username and password disappear from sync preferences

Every day that I launch a sync from Zotero, it fails, with the following message:

"The Zotero sync server did not accept your username and password.

Please check that you have entered your zotero.org login information correctly in the Zotero sync preferences."

I go to the sync preferences, re-enter my passord, and syncing proceeds. It seems to loose my password every day.
Is there a fix? Something in my FireFox settings wrong?
  • You might have a master password set up in Firefox for which you're cancelling the dialog. Don't use a master password.

    Beyond that, provide a Report ID.
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