Firefox releases: URL
https://ftp.mozilla.org/pub/firefox/releases/ Steps for install 46's: firefox --version wget -q https://ftp.mozilla.org/pub/firefox/releases/46.0.1/linux-x86_64/en-US/firefox-46.0.1.tar.bz2 tar -xjf firefox-46.0.1.tar.bz2 sudo rm -rf /opt/firefox sudo mv firefox /opt/firefox46 sudo rm -rf /usr/bin/firefox sudo ln -s /opt/firefox46/firefox /usr/bin/firefox firefox —version