If you're logged into the account, then all should be well.

If you have not signed into your Mozilla Account for two or more years then it may get scheduled for deletion. They send three email reminders to login to your Mozilla Account before then. https://support.mozilla.org/en-US/kb/mozilla-account-deletion-inactivity What the Mozilla Account is used for as it is very possible to use the Firefox browsers without using a Mozilla Account. https://support.mozilla.org/en-US/kb/access-mozilla-services-firefox-account#w_what-services-can-i-use-with-a-mozilla-account The Mozilla Account you posted this thread with should be considered active now.