Unable to open plex on a desktop

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I am running Plex Server on a desktop under win 10.today when I clicked on Open Plex It said “PLEX WEB would like to sign into your Plex Account”. I chose By Email and entered my username and password. A window pops up saying " you have been logged in sucesfully and will be redirected. Then it goes back to the sign in window. I can’t get out of the cycle. The server is still serving and mu login details are correct on the web site.

have you tried in an incognito/private window? or a different browser. Do you have any adblocker or similar browser extensions installed?

I have tried Edge and Opra and they work. Firefox has stopped working with Plex server but is ok with forums. At least I can now administer the server again.
Thanks.

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