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CRES Email Cisco Registered Envelope Service

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I deal with a couple organizations that use CRES for external emails. The sender sends an HTML attachment via regular email. Opening the attachment goes to a login screen and displays the message after the user enters credentials.

I can open the attachment using Edge or Chrome but not Firefox. After I enter credentials in Firefox, I just get a screen showing the word "Error".

Has Mozilla looked at this problem and is there a solution, or should I just use the other browsers for these messages?

Thanks, Ken.

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