Using no-proxy setting in firefox

as in internet explorer and opera browsers we can add ip ranges (in format 192.168.* for ip range 192.168.0.0 to 192.168.255.255) for which no proxy should be used, but firefox handles this setting differently, it does not accepts wild cards *. for the same range 192.168.0.0 to 192.168.255.255 setting in firefox should be:
Goto>> Edit >> prefernces (Tools >> options) for windows)

Goto > Advanced >> Network

in Settings use manual proxy settings
in no proxy for settings there should be localhost, 127.0.0.1
for adding above mentioned ip range add 192.168.0.0/16 and it should look like
localhost, 127.0.0.1, 192.168.0.0/16

192.168.0.0/16 means, starting from 192.168.0.0 to 2^16 ipaddress

(2^8 = 256 & 2^16 = 256x256)