The Firestorm Team provides the most popular viewer in Second Life™. They provide a new user area training people new to SL. They provide and maintain a JIRA, website, and wiki. There is a cost for all of these things.
About 2-years ago they ran a fundraiser and have been paying for stuff from that effort. Now those funds are running low. It is time for a new fundraiser. See the article Gacha! A Firestorm Fund Raiser!
Or… you can make donations directly to Kio Feila in-world.
These funds go toward paying expenses. All labor is from volunteers.