URL: https://www.fedex.com/secure-login/en-us/#/error

Browser / Version: Firefox 91.0
Operating System: Windows 10
Tested Another Browser: Yes Chrome

Problem type: Site is not usable
Description: Unable to login
Steps to Reproduce:
Log in at the top, page refresh, enter email/pass, and click log in, and the site refreshes to state " We are having trouble establishing a connection. Please refresh the page."
I refresh the page and the site didn't log me in. I can use it in Edge or Chrome just fine.

View the screenshot

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