Latest ESR version
cd /opt
sudo wget -O FirefoxESRLatest.tar.bz2 "https://download.mozilla.org/?product=firefox-esr-latest&os=linux64&lang=cs"
sudo tar xfj FirefoxESRLatest.tar.bz2
sudo mv /usr/bin/firefox /usr/bin/firefoxoldESR sudo ln -s /opt/firefox/firefox /usr/bin/firefox (for DEB systems)
Latest version
cd /opt
sudo wget -O FirefoxLatest.tar.bz2 „https://download.mozilla.org/?product=firefox-latest&os=linux64&lang=cs“
sudo tar xfj FirefoxLatest.tar.bz2
sudo mv /usr/bin/firefox /usr/bin/firefoxold
sudo ln -s /opt/firefox/firefox /usr/bin/firefox