How to install firefox in kali linux.

To install firefox in kali linux first you remove iceweasel, (iceweasel is default browser come preinstalled with kali linux)
 to remove iceweasel

apt-get remove iceweasel

then install firefox by command:

echo -e "\ndeb http://downloads.sourceforge.net/project/ubuntuzilla/mozilla/apt all main" | tee -a /etc/apt/sources.list > /dev/null
apt-key adv --recv-keys --keyserver keyserver.ubuntu.com C1289A29
apt-get update
apt-get install firefox-mozilla-build