Firefox is a web browser and you do not need an account to use it. Firefox Accounts has been renamed as Mozilla Accounts since November 1, 2023 to reflect that the account is not just used for Firefox Sync anymore. You are using a Mozilla Account to post this thread on the support.mozilla.org community support forum. https://support.mozilla.org/en-US/kb/firefox-accounts-renamed-mozilla-accounts https://support.mozilla.org/en-US/kb/access-mozilla-services-firefox-account#w_what-services-can-i-use-with-a-mozilla-account