Actually I resolved it. I had to wipe the installed version of firefox and installed a old version (55.0)
apt-get purge -y firefox
wget https://sourceforge.net/projects/ubuntuzilla/files/mozilla/apt/pool/main/f/firefox-mozilla-build/firefox-mozilla-build_55.0.1-0ubuntu1_amd64.deb
sudo dpkg -i firefox-mozilla-build_55.0.1-0ubuntu1_amd64.deb
That fixed the issue