Enable transparent DNS proxying in Firefox.
Enable transparent DNS proxying in Firefox.

Fixes https://github.com/uProxy/uproxy/issues/1772

qida/uproxy,dhkong88/uproxy,chinarustin/uproxy,jpevarnek/uproxy,MinFu/uproxy,dhkong88/uproxy,itplanes/uproxy,roceys/uproxy,MinFu/uproxy,dhkong88/uproxy,itplanes/uproxy,IveWong/uproxy,MinFu/uproxy,dhkong88/uproxy,qida/uproxy,qida/uproxy,itplanes/uproxy,qida/uproxy,dhkong88/uproxy,chinarustin/uproxy,roceys/uproxy,uProxy/uproxy,IveWong/uproxy,roceys/uproxy,uProxy/uproxy,itplanes/uproxy,IveWong/uproxy,uProxy/uproxy,chinarustin/uproxy,jpevarnek/uproxy,roceys/uproxy,MinFu/uproxy,itplanes/uproxy,MinFu/uproxy,qida/uproxy,jpevarnek/uproxy,uProxy/uproxy,roceys/uproxy,chinarustin/uproxy,jpevarnek/uproxy,chinarustin/uproxy,IveWong/uproxy,uProxy/uproxy,jpevarnek/uproxy