The connection is considered secure, but Firefox doesn't see the security certificate?

Question

Digital certificates

All browsers installed on computers open sites, considering the connection safe, except for the portable version of Firefox, which does not allow opening sites. Tell me what could be the problem? Why is Firefox, or rather its portable version, blocking the connection?

Next, I click the "Add Exception" button and the following window pops up:

Next, I click "Confirm Security Exception", but nothing happens. The same situation, sites do not open, although other browsers do not block anything. Below is a screenshot from the Opera browser.

Tell me what could be the problem and how to solve it?