What is the site?

The sites were: https://www.bing.com/ and https://postimages.org/

Now they are not blocked so I hope it was a one time occurrence. It had to do with the validity of the certificates.

Thanks

No problem clicking on them they load just fine. Check your security software.

PaulineLane said

I need to override the CONNECTION IS NOT SECURE error message. It is affecting almost all my browsing pages.

This is not a issue with Firefox 65.0 but likely with a security software such as a antivirus client like Avast or AVG.

If you have Avast or AVG then there should be an hotfix in a update from them today starting at 9am Pacific in fixing the issue they were cause with https:// connections in Firefox.

https://support.mozilla.org/en-US/kb/error-codes-secure-websites#w_the-error-occurs-on-multiple-secure-sites https://support.avast.com/en-us/article/189/

PaulineLane said

Also what is a telephone number I can use to call Firefox support?

The company Mozilla that makes the Firefox web browsers does not have the resources that would be needed to provide call centres for one on one support by phone, chat or email, especially since it would be for free for a free product. Any product that has one on one support are generally paid for products.

Thank you for the replies. This apparently was a temporary condition. The sites are opening fine for me now.