[Mozilla Enterprise] Strange problem with 78.1.0esr

[Osdoba, Sascha]

Hi,

we are testing firefox 78esr and i see a strange problem which not exist on 68esr.

We have a Raritan IP kvm switch (Device Model: DKX3-216, Firmware: 3.5.0.5.1952). There is a timeout configured and after this is reached open sessions will be closed and you will be redirected to login page of the kvm. But this doesn't work anymore with 78esr.
there is just an rolling icon, no right click, no F12, nothing seems to work. If I try to do manually reload it doesn't work, page doesn't load. I have to close the tab and open the page again then it works as normal.



Regards,
Sascha