Why do I see the error 'Your connection is not secure' 'The owner of play.vidyard.com has configured their website improperly' in Firefox?

Overview

On the Firefox browser, you may come across an error that appears where the player should be.

The error message shows 'Your connection is not secure' 'The owner of play.vidyard.com has configured their website improperly'.

Cause

This error is caused by your Anti-Virus (AV) software detecting that the Vidyard player is being loaded with different security certificates than the site you are visiting. This type of AV security can help protect a machine when browsing the web, but in this case, it is being overly cautious.

Solution

Whitelist the play.vidyard.com domain in the AV software. The way to do this will differ between AV packages, so refer to the software's documentation.