Hello @Greg Stein ,
Please try to exclude the user from the GPO of Google Chrome and then configured another GPO of Mozilla Firefox for the user instead.
https://social.technet.microsoft.com/Forums/windowsserver/en-US/bdaf120c-f4d6-4548-98ea-2c43dcd07c80/exclude-one-user-from-group-policy?forum=winserverGP
https://www.faqforge.com/windows-server-2016/exclude-user-computer-group-policy-object/
Best regards,
Leila
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