Why does the Firefox browser refuse to connect to sites?

Question

Browsers

Good day. Often you have to work with the Firefox browser, or rather with its portable versions. I download the latest version from the official site, at first it works fine, but after a few days the browser starts refusing to connect to sites, notifying "Your connection is not secure".

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

Answer 1

The problem was successfully solved by disabling SSL checking in the antivirus.
The fact is that antiviruses can intercept connections for wiretapping and monitoring at a time when Firefox is also trying to process this data. Accordingly, the browser has no way to check the correctness of the certificates. To protect the user from a potential threat, it replaces the web page with the message "Your connection is not secure." To eliminate the conflict between the antivirus and the browser, it is necessary to disable the function of checking SSL and HTTPS protocols.