Data Usage page does not display in web browser

https://xfinity.com/usagemeter 

Does not display any information. As I will be charged if I go over my allotted 1.2TB of data, it is very important that I be able to check on my data use. While I understand this information can be obtained from the phone application, this is an unacceptable solution, as my computer is what is using the majority of the data. Please resolve this issue.