Be careful. Something doesn’t look right. Firefox spotted a potentially serious security issue with ib.postbank.ir. Someone pretending to be the site could try to steal things like credit card info, passwords, or emails.

Looks like a security issue, if you trust yourself you can probably override it ???

That link isn't a secure link. It's http://

I get the same ... did you click on Advanced?

The certificate is for an Iranian bank and there are sanctions on Iran so it could also be that

If this is the same certificate or similar case as support.mozilla.org/questions/1598379 that has been revoked. The site operator needs to replace it.