I need to download a certificate from a device in my networt called secunet Konnektor https://www.secunet.com/loesungen/einboxkonnektor on the manual it's written how to do it. https://www.secunet.com/loesungen/einboxkonnektor#c1607 I suggest to find a manual somewhere in the first link or in google: chapter 7.4.3 go to chrome (same with edge) click on the lock on the left hand side of the link https://XXX.XXX.XXX.XXX:8500/management somehow click on the button where you can open a small windows called "certificate". The "General" tab shows informations about the certificate. Click on the tab "Details" and click on "Copy file". The certificate-assitent opens and after clicking on next, you choose DER-coded-binary X.509 (.CER) Save the file somewhere where you can find it. I can't do this on firefox On firefox I can find a lock on the left hand side of the link https://XXX.XXX.XXX.XXX:8500/management when i click on it and then on something else, i can then click on more informations. a windows opens called "page informations" under "security" i click on "view certificates" and a new tabs opens called "certificate for konnektor". but there is no possibilty to download a cer-file. only a pem file and it doesn't really help me.