Update Firefox to 55

Author: jacebrowning

Dockerfile

@@ -12,8 +12,16 @@ https://raw.githubusercontent.com/technomancy/leiningen/stable/bin/lein && \
 sudo chmod +x /usr/bin/lein && \
 lein --version
 
-# Firefox WebDriver
+# Firefox
 
-RUN curl -L https://github.com/mozilla/geckodriver/releases/download/v0.17.0/geckodriver-v0.17.0-linux64.tar.gz \
+RUN sudo wget https://ftp.mozilla.org/pub/firefox/releases/55.0/linux-x86_64/en-US/firefox-55.0.tar.bz2 && \
+sudo tar -xjf firefox-55.0.tar.bz2 && \
+sudo rm -rf /opt/firefox* && \
+sudo rm firefox-55.0.tar.bz2 && \
+sudo mv firefox /opt/firefox55 && \
+sudo ln -sf /opt/firefox55/firefox-bin /usr/bin/firefox && \
+firefox --version
+
+RUN curl -L https://github.com/mozilla/geckodriver/releases/download/v0.19.0/geckodriver-v0.19.0-linux64.tar.gz \
 | sudo tar xz -C /usr/local/bin && \
 geckodriver --version