jehan / Dominos Pizza Voucher Codes

Hi. Is this script still usable.
I tried using it today for the first time in a few months and it seems that that may have been a Dominos site upgrade.
Either that or that I am using firefrox and there was the quantum upgrade that made all the extensions and addons i had "legacy".

Alas I am not seeing the turtle on the page anymore. I have made sure I have the most recent greasemonkey version and I have tried removing and reinstalling the script.

Any help is much appreciated