Update updater.sh

updater.sh

@@ -10,11 +10,14 @@ echo -e "\nThis script should be run from your Firefox profile directory.\n"
 
 currdir=$(pwd)
 
-## get the full path of this script (readlink for Linux, greadlink for Mac with coreutils installed, fallback otherwise)
-scriptfullpath=$(readlink -f "${BASH_SOURCE[0]}" 2>/dev/null || greadlink -f "${BASH_SOURCE[0]}" 2>/dev/null || "${BASH_SOURCE[0]}")
+## get the full path of this script (readlink for Linux, greadlink for Mac with coreutils installed)
+sfp=$(readlink -f "${BASH_SOURCE[0]}" 2>/dev/null || greadlink -f "${BASH_SOURCE[0]}" 2>/dev/null)
+
+## fallback for Macs without coreutils
+if [ -z "$sfp" ]; then sfp=${BASH_SOURCE[0]}; fi
 
 ## change directory to the Firefox profile directory
-cd "$(dirname "${scriptfullpath}")"
+cd "$(dirname "${sfp}")"
 
 echo -e "Updating the user.js for Firefox profile:\n$(pwd)\n"