I have issued with one problem

i configured tor, privoxy, proxychains, firefox
when i am using firefox with manual proxy configuration, works fine, i mean without DNS leaks
but when i am using <proxychains firefox site>, in wireshark/tcpdump my dns request, and replies
can anyone help?
In firefox i configured about:config.

i tested this on another PC with Fedora, i installed tor, privoxy, proxychains and there <proxychains firefox site> works without dns leaks.