파이썬 Selenium The browser appears to have exited before we could connect. 에러해결방법

selenium.common.exceptions.WebDriverException: Message: The browser appears to have exited before we could connect.

에러발생시

firefox --version
    Mozilla Firefox 47.0
apt-get remove firefox
wget https://ftp.mozilla.org/pub/firefox/releases/45.0/linux-x86_64/en-US/firefox-45.0.tar.bz2
tar -xjf firefox-45.0.tar.bz2
mv firefox /opt/firefox45
ln -s /opt/firefox45/firefox /usr/bin/firefox
firefox --version
    Mozilla Firefox 45.0

파이어폭스 상위버전과 selenium 호환문제인듯 하다.