Plex Media Server fails constantly to login on Firefox web browser

Server Version#: 1.21.1.3795-ee64ab56f

I am having a lot of issues when connecting PLEX to my Firefox web browser.
This is happening since the last update.
I am not having problems with different browsers, like Edge from Microsoft.
Please, fix this ASAP, is very annoying.

Clear your Temp files.

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