How to downgrade to Firefox 56.0
Backup your current settings if needed
cp -rp .mozilla/ .mozilla_bk
Purge current firefox
sudo apt-get purge firefox -y
Download 56 version
wget https://ftp.mozilla.org/pub/firefox/releases/56.0/linux-x86_64/en-US/firefox-56.0.tar.bz2 sudo su tar -xvf firefox-56.0.tar.bz2 cp -rp firefox /opt/ cd /usr/bin ln -s /opt/firefox/firefox firefox
Finally, you have to avoid upgrading to the newer version.… Read the rest