If you actually click chat with us on /r/firefox they wrote
✨NEW✨ Sister Kbin community: https://fedia.io/m/firefox ⭐ r/Firefox is protesting Reddit, and is DOWN, but you can join our sister Kbin community. ⭐ Official Matrix room for the r/firefox community on reddit. The latest news and developments on Firefox and Mozilla, a global non-profit that strives to promote openness, innovation and opportunity on the web.
If you actually click chat with us on /r/firefox they wrote
Don’t see it until you click so I don’t think lot of people knew about fedia.io/m/firefox