Firefox is a free, open source web browser made by Mozilla.
Firefox Hello was a WebRTC based feature for doing browser to browser calls, audio, video or both, which you can setup with a hyperlink as part of an indieweb communication/contact page. It was removed in version 49.
Firefox introduced a "Share" toolbar button in Firefox 23 to share the current page to a share provider of the user’s choice, including any Known site (on Withknown.com or your own server). It was removed in version 57.
Firefox OS is an open source mobile operating system developed by Mozilla, based on Linux and the Gecko web rendering engine.