URL: https://console.aws.amazon.com/cloudformation

Browser / Version: Firefox 76.0
Operating System: Windows 10
Tested Another Browser: Yes Chrome

Problem type: Something else
Description: Attempting to upload a CloudFormation template fails with an "ajax error 401" message
Steps to Reproduce:
When I select the template to upload in CloudFormation and click "Next" to proceed, I get a red banner at the top of the page with a "ajax error 401" message and it returns me to the upload screen I just came from. This doesn't occur on other browsers.

View the screenshot

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