Please uninstall, reboot and reinstall.
Having checked here FireFox 36 is working just fine. From the sounds of it key files were not replaced when you installed 8.095.
I have done that. Clean install of firefox 36.0.1 and now the menu text and the text inside firefox is all blurry. (not the websites)
just the text in menu, etc.
Disable Use Hardware acceleration when available. does not fix it.
Tried all the stardock skins. Tried unloaded WB doesnt help either.
When completely uninstalled windowblinds 8.095 then firefox is all good again.
Using firefox 36.0.1 and windows 8.1 pro x64
Windows 8.1 Pro (9600.winblue_r8.150127-1500)
WindowBlinds 8.095 (034 - Windows 8 Edition) - 64 bit OS
Wblind.dll 2015/02/23 16:57:ll
Wblind64.dll 2015/02/23 16:57:30
Wbsrv.dll 2015/02/04 15:43:01
WB8Config.exe 2015/01/27 17:41:11
Wbload.dll 2015/02/24 13:53:33
Screen.exe 2015/02/03 14:46:50