Firefox web browser reporting an error with RecoverToy SSL

We are currently experiencing Firefox web browser reporting an error with RecoverToy SSL certificate.

The RecoverToy SSL Certificate is correct and can be trusted. However, Firefox is not agreeing with the SSL Authority.

Please use Internet Explorer, Safari, Opera, or the new Microsoft Edge browser instead of Firefox.

We have logged queries with various support agencies to try and rectify the issue.

Update: This issue seems to have rectified itself. Not sure what caused it, but it is no longer happening.