Yandex browser problem with a certificate

Fox also has an unsecured site connection and you can access the site at your own risk.

Alternatively, manually update the security certificate.

https://letsencrypt.org/certificates/



In the browser settings, you need to find a section with certificates, I don't know where it is in the browser, but, probably, there should be a search for the settings. Import the downloaded certificate in der or pem format.