Always download latest stable Firefox by default (#713)

* Always download latest stable Firefox by default

* Simplified if/else logic for Firefox latest download

* Fixed download logic that was causing build to error out

Author: testphreak

NodeFirefox/Dockerfile.txt

@@ -3,8 +3,8 @@ USER root
 #=========
 # Firefox
 #=========
-ARG FIREFOX_VERSION=59.0.1
-RUN FIREFOX_DOWNLOAD_URL=$(if [ $FIREFOX_VERSION = "nightly" ] || [ $FIREFOX_VERSION = "devedition" ]; then echo "https://download.mozilla.org/?product=firefox-$FIREFOX_VERSION-latest-ssl&os=linux64&lang=en-US"; else echo "https://download-installer.cdn.mozilla.net/pub/firefox/releases/$FIREFOX_VERSION/linux-x86_64/en-US/firefox-$FIREFOX_VERSION.tar.bz2"; fi) \
+ARG FIREFOX_VERSION=latest
+RUN FIREFOX_DOWNLOAD_URL=$(if [ $FIREFOX_VERSION = "latest" ] || [ $FIREFOX_VERSION = "nightly-latest" ] || [ $FIREFOX_VERSION = "devedition-latest" ]; then echo "https://download.mozilla.org/?product=firefox-$FIREFOX_VERSION-ssl&os=linux64&lang=en-US"; else echo "https://download-installer.cdn.mozilla.net/pub/firefox/releases/$FIREFOX_VERSION/linux-x86_64/en-US/firefox-$FIREFOX_VERSION.tar.bz2"; fi) \
   && apt-get update -qqy \
   && apt-get -qqy --no-install-recommends install firefox \
   && rm -rf /var/lib/apt/lists/* /var/cache/apt/* \