Unable to log in on PVE servers with Firefox since update to 7.4-3

I have a three machine cluster and have used one as the 'main' interface for a year or so. I use Firefox as my main browser on a KDE desktop.

I upgraded to 7.4-3 last week and since then I have been unable to log in on the machine I usually log into. I have also now found that the other machines cannot be logged in more than once. I have tried clearing cookies and all data but it still fails. There are no errors in the developer console. Chromium and Vivaldi still work so I can still...

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