NZPost's parcel booking form doesn't work as designed on Firefox; specifically the courier pickup form, which is supposed to drop down when you click a button.
I've contacted NZPost about this, including screenshots and dev console messages. I've had no reply and, two months later, the form is still broken.
The button often does nothing apart from give itself a duplicate icon. Sometimes the form does roll down ... and immediately rolls up again.
Grrrr ....
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