HSTS error

Since about a month ago, when I try to download Dailymotion video I often get:

"Your connection is not secure

The owner of s10.savefrom.net has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate.

Learn more…"

My Firefox browser is up to date.  I put the link on the website instead of using extension.

I have to restart the browser several times so the error goes away.  Any permanent fix?