Every Time I Try To See My Bill Online It Logs Me Out of Xfinity

Title.  When signed in, I click "Go to Billing" where I'm met with my current amount due.  I want to see the details so I try clicking either See Current Statement or See Upcoming Charges, either one, doesn't matter, but when I do it then kicks me all the way out of xifinity and back to the sign in page... where I start all over, sign in, click My Account, click "Go to Billing" and once again when trying to view my current statement it logs me out and back to the intro screen.

I am NOT getting another browser if it's a browser issue.  Firefox is not the most popular one, but it's not the least either.  Either it works with Firefox... or I'll cancel Comcast.  Which will it be?

I'm sick and tired of constantly being logged out when I want to just view my bill.  Why is this so hard?