ci: Disable Firefox updates

.circleci/scripts/firefox-install

@@ -7,13 +7,23 @@ set -o pipefail
 FIREFOX_VERSION='61.0.1'
 FIREFOX_BINARY="firefox-${FIREFOX_VERSION}.tar.bz2"
 FIREFOX_BINARY_URL="https://ftp.mozilla.org/pub/firefox/releases/${FIREFOX_VERSION}/linux-x86_64/en-US/${FIREFOX_BINARY}"
+FIREFOX_PATH='/opt/firefox'
 
 printf '%s\n' "Removing old Firefox installation"
 
-sudo rm -r /opt/firefox
+sudo rm -r "${FIREFOX_PATH}"
 
 printf '%s\n' "Downloading & installing Firefox ${FIREFOX_VERSION}"
 
 wget --quiet --show-progress -O- "${FIREFOX_BINARY_URL}" | sudo tar xj -C /opt
 
 printf '%s\n' "Firefox ${FIREFOX_VERSION} installed"
+
+{
+  printf '%s\n' 'pref("general.config.filename", "firefox.cfg");'
+  printf '%s\n' 'pref("general.config.obscure_value", 0);'
+} | sudo tee "${FIREFOX_PATH}/defaults/pref/autoconfig.js"
+
+sudo cp .circleci/scripts/firefox.cfg "${FIREFOX_PATH}"
+
+printf '%s\n' "Firefox ${FIREFOX_VERSION} configured"

.circleci/scripts/firefox.cfg

@@ -0,0 +1,13 @@
+// IMPORTANT: Start your code on the 2nd line
+
+lockPref("app.update.enabled", false);
+lockPref("app.update.auto", false);
+lockPref("app.update.mode", 0);
+lockPref("app.update.service.enabled", false);
+
+pref("browser.rights.3.shown", true);
+
+pref("browser.startup.homepage_override.mstone","ignore");
+
+lockPref("plugins.hide_infobar_for_outdated_plugin", true);
+clearPref("plugins.update.url");