Mozilla may go about deleting a Mozilla Account that has not been logged into for two or more years due to inactivity. There will be email notifications before the date. https://support.mozilla.org/en-US/kb/mozilla-account-deletion-inactivity It is possible to use the Firefox web browsers for desktop and mobile without using a Mozilla Account as this kb article shows what a Mozilla Account can be used for besides this support.mozilla.org site. https://support.mozilla.org/en-US/kb/access-mozilla-services-firefox-account#w_what-services-can-i-use-with-a-mozilla-account Firefox Accounts was renamed as Mozilla Accounts back on November 1at, 2023 to reflect that it was not longer being used just for Firefox Sync. https://support.mozilla.org/en-US/kb/firefox-accounts-renamed-mozilla-accounts Edit: By logging in and posting this thread here should confirm it is an active Mozilla account now.