Use unbranded build of latest firefox release instead of esr60

install.sh

@@ -58,19 +58,27 @@ if [ "$TRAVIS" != "true" ]; then
 	pip install --user --upgrade -r requirements.txt
 fi
 
-# Grab the latest version of Firefox ESR.
-# For security reasons it is very important to keep up with patch releases
-# of the ESR, but a major version bump needs to be tested carefully.
-# Older ESRs are not supported by geckodriver.
-firefox_version="$(curl 'https://ftp.mozilla.org/pub/firefox/releases/' |
-grep '/pub/firefox/releases/60.' |
-tail -n 1 | sed -e 's/.*releases\///g' | cut -d '/' -f1)"
+# ESR 60 has a bug that prevents WebExtension Experiments in unsigned
+# addons from working. Until its fixed, we'll download an Unbranded
+# build of the latest release.
 
-wget https://ftp.mozilla.org/pub/firefox/releases/${firefox_version}/linux-$(uname -m)/en-US/firefox-${firefox_version}.tar.bz2
-tar jxf firefox-${firefox_version}.tar.bz2
+# # Grab the latest version of Firefox ESR.
+# # For security reasons it is very important to keep up with patch releases
+# # of the ESR, but a major version bump needs to be tested carefully.
+# # Older ESRs are not supported by geckodriver.
+# firefox_version="$(curl 'https://ftp.mozilla.org/pub/firefox/releases/' |
+# grep '/pub/firefox/releases/60.' |
+# tail -n 1 | sed -e 's/.*releases\///g' | cut -d '/' -f1)"
+# 
+# wget https://ftp.mozilla.org/pub/firefox/releases/${firefox_version}/linux-$(uname -m)/en-US/firefox-${firefox_version}.tar.bz2
+# tar jxf firefox-${firefox_version}.tar.bz2
+
+wget https://index.taskcluster.net/v1/task/gecko.v2.mozilla-release.latest.firefox.linux64-add-on-devel/artifacts/public/build/target.tar.bz2
+tar jxf target.tar.bz2
 rm -rf firefox-bin
 mv firefox firefox-bin
-rm firefox-${firefox_version}.tar.bz2
+# rm firefox-${firefox_version}.tar.bz2
+rm target.tar.bz2
 
 # Selenium 3.3+ requires a 'geckodriver' helper executable, which is not yet
 # packaged.