@MrZipf I watch NOW TV with Firefox on my Windows 7 laptop and know of other using it on their Mac. Yes it's not the greatest experience but it does work. However as you have a Windows 10 machine just download the NOW TV app from the Microsoft Store, a lot less hassle.
----- I'm a Community Contributor not staff, so whilst I know a lot about the service I will be unable to help with any account issues. Did you find this post useful, why not give some Thanks?