The official Firestorm domains are the following:
firestormviewer dot org - Firestorm Viewer – The Phoenix Firestorm Proje...
wiki dot phoenixviewer dot com - start [Phoenix Firestorm Project - Wiki]
jira dot phoenixviewer dot com - System Dashboard - Firestorm Bug Tracker

There is no "pro" in any of our URLs.

Thanks for this. I recently recommended the viewer to a returning user, and they are thrilled with the performance it adds to their SL experience.

Firestorm is warning us when those of us already using it log in, for which I'm grateful

hojeez, thank you for the warning, I'll let my friends know

Thanks for the head's up!