Create key like this, and it will work with all browsers... just tested with mozilla & netscape
Server authentication was set to SSL2 from io.
makecert.exe -r -n "cn=192.168.1.11" -b 01/01/2000 -e 01/01/2010 -eku 1.3.6.1.5.5.7.3.1 -ss my -sr CurrentUser -a
md5 -sky exchange -sp "Microsoft RSA SChannel Cryptographic Provider" -sy 12 c:\cert\ioftpd.cer