email Mozilla acct & data will be deleted

This sounds like you got 1-3 emails from Mozilla about your Mozilla Account being deleted on a set date. The emails are a heads up to log into your Mozilla Account before said date in order for the account to remain active and not be deleted. By logging into this support.mozilla.org site with your Mozilla Account it should now be considered active. https://support.mozilla.org/en-US/kb/mozilla-account-deletion-inactivity https://support.mozilla.org/en-US/kb/sumo-profile-inactive-deleted What Mozilla Accounts are used for https://support.mozilla.org/en-US/kb/access-mozilla-services-firefox-account#w_what-services-can-i-use-with-a-mozilla-account (formerly called Firefox Account until Nov 2023).