+url_firefox="https://ftp.mozilla.org/pub/firefox/releases/66.0/linux-x86_64/en-US/firefox-66.0.tar.bz2"
+wget "${url_firefox}"
+mv firefox-66.0.tar.bz2 /opt/
+cd /opt/
+tar xf firefox-66.0.tar.bz2
+rm firefox-66.0.tar.bz2
+ln -s /opt/firefox/firefox /usr/local/bin/
+update-alternatives --install /usr/bin/x-www-browser x-www-browser /opt/firefox/firefox 200
+update-alternatives --set x-www-browser /opt/firefox/firefox
+cd "${setup_scripts_dir}"
+