I got home late tonight, Wednesday. I see there is a new release of Firestorm Viewer out, version: 4.1.1 (28744). This viewer has been a work in progress for about four months. So, lots of new stuff.
Get the download here: Firestorm-Phoenix Viewer Download.
You can read the official announcement on the FS/PH Blog: Major Firestorm Viewer Update! It has a list of the more interesting updates and new features. A full list of changes, fixes, and features is in the Firestorm 4.1.1 Release notes.
Inara Pey has a more detailed review on her site: Firestorm 4.1.1.28744. Her review hits some of what she sees as the import changes. One being this viewer is more stable than the previous version, which is good.