The solution to viewing Mesh in Firestorm viewer or other Second Life viewers while using an AMD video card is located here:
It would seem to be a DLL loading issue with last few renditions of the Catalyst drivers. The solution provided in that forum (it works I have tested it) suggests putting these DLL files into your SL Viewer's main directory:
(I suggest doing a file search to locate each file then copy all 4 files to your SL directory.)
Once all of these files are inside the SL Viewer's main install directory you will finally be able to Enable Hardware Skinning and still see Mesh with proper FPS rates.
ASUS A78M Mobo, PSU Toughpower 650W, AMD A10-5800K Quad Core 3.8GHz, 16GB DDR3 Dual Channel, 4 SATA HD = over 3TB, Sapphire R7 250 2Gb, Windows 8.1 Bing, LG 27" IPS Widescreen & ASUS 21" Widescreen.