Fire fox will not open plex server

[Edwardlotz]

Server Version#:4.57.4
Player Version#:

Firefox version 89.0.1
MacOS 11.4

With the latest update if Firefox I can not log in Plex. I get an error when trying to log in. See the screenshot.

I am storing cookies and I can log into plex using safari with no issue. I have always used Firefox until now.

Does anyone have a thought.

[SE56]

Clear all history and sign back in.