Firestorm released version 5.0.11.53634. The download is here.
Controversy and Confusion
There are some controversial changes in this version of the viewer. I think the controversy is from confusion which is from ignorance.
The issue is about the Level of Detail (LoD) setting RenderVolumeLODFactor found in the debug settings (Ctrl-Alt-D=Menu Advanced->Debug Settings). The Firestorm Team has explained why they are making the change. See LOD and The Upcoming Firestorm Release The What and Why. It gets all technical, but it is an accurate description of how SL works.

The TL:DR is that high RenderVolumeLODFactor settings have your computer spending time drawing complex things which are so far away they only take up one or two pixels on your screen. Does it matter if a jacker has a dozen buttons if the whole jacket is so far way it can be drawn in 4 pixels and is just a tiny tiny spot on your screen? If you can’t see the buttons, why draw them? LoD is about making these optimizations and providing better performance.
Doing all the useless drawing of thousands of pixels to average them down to 4 pixels for your screen lags your render process and slows the SL system because all that detail has to be downloaded. Dumb move.
