To help you fill the CRNs quickly.
The CityU Quick Course Adder is a helpful Chrome extension that makes entering CRNs faster. You just preload your CRNs, and the extension will automatically instantly put them on the 'Add or Drop Classes' page for you. It's a real time-saver!
This is an updated version, building on the original 2016 version by Sam (ideati.me), which is no longer available.