Hello, we have web application installed in internal network. We are using it for many years and we are installing upgrades and security updates (It is not public application so I can't give you the name). It have possibility to generate certificate request and import signed certificate so we are doing this for many years, with success. We have local Certificate Authority and of course, root and intermediate certificates are imported in FF cert store. After last App and FF update I'm receiving Security Warning (screen shots uploaded). This appears in several FF versions. Same app is 'secure' in Chrome and IE (screen shot from Chrome). How can I solve this problem?

Thanks in advance. Miodrag