Hi Susan
My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.
Just to isolate the problem, could you check if this also happens in Microsoft Edge or Internet Explorer?
Press Windows key + R
Type: iexplore
Hit Enter
Try browsing the web site.
I would also try clearing your Firefox Cache:
How to clear the Firefox cache | Firefox Help - Mozilla Support
https://support.mozilla.org/en-US/kb/how-clear-...
Still not working?
Open Start, type: CMD
Right click CMD
Click Run as administrator
Type in at the prompt OR Copy and Paste these one at a time : (Hit enter after each)
ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renew
NETSH winsock reset catalog
NETSH int ipv4 reset reset.log
NETSH int ipv6 reset reset.log