Is your computer date and time correct? What antivirus do you have?

This usually happens if you visit a website that isn't meant to be accessed via a secure connection or there is otherwise a problem with the certificate. If there is an advanced button at the bottom of the error page then click this button to see what information is showing and what domain mismatch this is about.

cor-el, did you even read post? I cannot even go to qsurvey.mozilla.com. You think Mozilla has problems with their certificate?

I will re-install hopefully that will correct it.

Did you check your date and time? What antivirus do you use. Have you run a scan with Malwarebytes?

Thanks Tyler for the reply, I just figured out how to respond.

Seems strange to ask about date and time, but YES date and time are correct!

I am running Norton I run multiple scans but not Malwarebytes.

Ralph

I'd suggest running a scan with Malwarebytes, and then check if there are any addons in Firefox from Norton

This error message is shown on the about:neterror page and on this page there is usually some detail available about what is wrong. That detail might give a lead on where to look for the cause of the problem.

Doesn't this error page have an Advanced button at the bottom right in case this detail is currently hidden?

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

Thanks every one for the replies!!

I re-installled Firefox no longer have the problem.

Ralph