Password Manager from Bitdefender

Hello. I am trying out /testing password manager from Bitdefender.

I installed the extension on Firefox browser. Now, when I open Firefox I get a warning (from Bitdefender itself) saying:

firefox.exe attempted to establish a connection relying on an expired certificate to prodh-tmg.mhtr.be. We blocked the connection to keep your data safe since websites must renew their certificates with a certification authority to stay current, and outdated security certificates represent a risk

If I search on google I can trace it back to Cloudflare. I assume it is a 'normal' notification but why is it then listed as critical by Bitdefender.

Is using password manager online not so secure? (online I guess is never realy secure)

Maybe someone knows, can I ignore this 'critical' warning?

Thanks/Regards

James