Mozilla Firefox or Firefox for short is the name of the web browsers for Windows, macOS, Linux and mobile versions for iOS/iPadOS and Android. Mozilla is who makes the Firefox web browsers. Firefox Accounts has been called Mozilla Accounts since November 1, 2023. 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 as this site support.mozilla.org is one of those places it is used.