how manually install firefox-developer in kali linux

wget https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=uk
tar xvjf firefox*.tar.bz2
sudo su
cd ~/Downloads/
mv firefox /opt
nano /usr/share/applications/firefox-developer.desktop

put configuration:

[Desktop Entry]
Name=Firefox Developer
GenericName=Firefox Developer Edition
Exec=/opt/firefox/firefox
Terminal=false
Icon=/opt/firefox/browser/chrome/icons/default/default48.png
Type=Application
Categories=Application;Network;X-Developer;
Comment=Firefox Developer Edition Web Browser

CTRL+O (Save)

chmod +x /usr/share/applications/firefox-developer.desktop

Complete.