0_1553775491570_11cfeea7-626f-41d8-be6a-3241756626dc-image.png

That's the certs, two old (still valid though) and two new ones (they have different DN's though)...

Logging into the page requiring mutual-auth I only see the two old ones in the list:

0_1553775592511_092ec469-3875-4307-87d6-e11933046f11-image.png

I checked and it is the same in Chrome though...

@Gwen-Dragon

I installed like described the nss-tools from openSUSE tumbleweed repository via:

sudo zypper in mozilla-nss-tools

Afterwords I installed the certificate, downloaded from FritzBox router:

certutil -d sql:$HOME/.pki/nssdb -A -t "P,," -n fritz.box -i ~/Downloads/boxcert.crt

And the verification shows me, that it was well installed:

certutil -d sql:$HOME/.pki/nssdb -L

I think now someone else can do it easier 😉

Update - after an restart, vivaldi shows a green locker symbol.