firefox　インストール

参考

firefox ダウンロード先

sudo apt-add-repository ppa:mozillateam/firefox-next
sudo apt-get update
sudo apt-get install firefox
wget https://github.com/mozilla/geckodriver/releases/download/v0.21.0/geckodriver-v0.21.0-linux64.tar.gz
tar -zxvf geckodriver-v0.21.0-linux64.tar.gz
sudo cp ./geckodriver /usr/local/bin

cf.