Allowing pop-ups on your Mozilla Firefox internet browser

From within your Firefox browser, please click on the menu button, located at the top right hand corner of your screen.  Select Options from the dropdown menu.

This will open on the General Preferences tab, please select the Content tab.

Untick the checkbox that appears alongside the Block pop-up windows field.

Please click on the Accept and Pay or Make Payment button in order to proceed to the Payment page.  Once your payment has been completed, please ensure that you change the Block Pop Ups setting to On.