Appointments not working in Firefox

HI

After having the plug in installed and working for a period of time. I just got a customer telling me it does not work on firefox, which has devastated me and made me think how much money I may have lost because of this.

you can see the page using appointments here

http://pg-fitness.co.uk/booking-form/

In firefox when you click on the day – it does NOT open up the hours in the day

I use a mac and this works fine in safari, I tried it with Firefox and it does not work.

Please somebody do get back to me on this ASAP.

I just presumed your plug in worked in all browsers.

Thank you in advance

Pete

https://wordpress.org/plugins/appointments/