About Mozilla Emojis
Mozilla's Firefox web browser uses a platform's native emoji support both on the web, as well as in apps for iOS and Android.
On Windows platforms, Firefox presents emoji designs from Twitter's Twemoji sets for emojis yet to be supported by Microsoft's own emoji set. These include flag emojis and many new additions from 2020's Emoji 13.0.
Previously a set of free, open-source emojis was planned by Mozilla for Firefox OS. Abbreviated to fxemoji in the open-source project, this emoji set is not being actively worked on further.