Problem with Qlik Sense in Firefox ESR 45.3.0

[pumpkin_power]

Hello, this is my first post.

We have a Qlik Sense Server Installation (3.1 SR4, qliksenseserver 10.7.3).

Everything is running well in IE, but with Firefox ESR 45.3.0 we have problems.

That's what we get:

It says the connection is unsecure. In the advanced settings when we tried to fix it we couldnt fix it.

Has someone a solution to the problem?

[pumpkin_power]

Our IT solved it, the reason that Qlik worked in IE but not in Firefox was due to single sign on. With the admin rights of the IT colleague we are able to circumvent this.