Please check this article: https://support.mozilla.org/en-US/kb/connection-untrusted-error-message

You can check the Server tab in the Certificate Manager.

• Tools > Options > Advanced > Certificates: View Certificates

Once you get to the Certificate Manager dialog, check the Servers mini-tab if that one is not displayed automatically. Please ignore the certificates with * listed for the server and look for the misspelled site.

I and find the Certificate Manager dialog. I am kind of technology challenged. When I click the Firefox icon I get Firefox internet but the screen is Xfinity (Comcast). Can you tell me how to get to the Firefox settings etc? I have a Dell Computer and Windows 7. Your directions seem simple enough if I would only find the Certificate Manger.

Thanks

So when you open your start page, you should have a main toolbar above the page that shows the address of the page on the internet, either comcast something or xfinity something, and bunch of icons. On the right end of that toolbar, look for the menu button, which has 3 horizontal bars. Alternately, you can tap the Alt key to activate the classic menu bar (File, Edit, View, etc.).

"3-bar" menu button (or Tools menu) > Options > Advanced

Within the Advanced section of the Options page, click the Certificates mini-tab, then the "View Certificates" button. That should open the Certificate Manager dialog. Click the Servers mini-tab there and you should be able to find server-specific exceptions that you added.

I think I just took over 100 words say what cor-el said in 10 words, but hopefully that will give you enough context to find it.

I did it!! Thank you so much. Your explanation was so easy to follow. A great learning experience for me.