Error 3048,3 periodically occurs

Setup: Windows 7. Norton Internet Security version 22.5.5.15. Firefox 44.0.2

1) Why do I continue to get the annoying Error 3048,3?

2) When I attempt to go to Norton Power Eraser, I get the following Firefox message:

Your connection is not secure

The owner of liveupdate.symantec.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.