hi, most likely it will be due to avast intercepting encrypted connections: How to troubleshoot security error codes on secure websites

First, as I said in my original question, I am using AVG security, not Avast. I did find an option in AVG to enable HTTPS scanning, and turned it off. After rebooting my computer, the problem is still there. As a side issue, why is this a problem with Firefox and not with any other browser?

could you please give us more information about the error by clicking on the error code, copying the text to the clipboard and then pasting it here into a reply in the forum like shown in the screenshot (like shown in the screenshot)? firefox uses its own dedicated certificate store, that's why it may behave differently like other browsers when the third-party has injected its certificate there...

Your connection is not secure

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

Learn more…

Report errors like this to help Mozilla identify and block malicious sites

www.mozilla.com uses an invalid security certificate.

The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported.

Error code: SEC_ERROR_UNKNOWN_ISSUER

https://www.mozilla.com/en-US/firefox/help/

Peer’s Certificate issuer is not recognized.

HTTP Strict Transport Security: false HTTP Public Key Pinning: false

Certificate chain:

MIIIrjCCCBegAwIBAgIEOIVVUzANBgkqhkiG9w0BAQsFADCB1jELMAkGA1UEBhMC VVMxETAPBgNVBAgMCFZpcmdpbmlhMQ8wDQYDVQQHDAZSZXN0b24xGzAZBgNVBAoM EkRpZ2l0YWwgUmVmbGVjdGlvbjExMC8GA1UECwwoRGlnaXRhbCBSZWZsZWN0aW9u IENlcnRpZmljYXRlIEF1dGhvcml0eTEbMBkGA1UEAwwSRGlnaXRhbCBSZWZsZWN0 aW9uMTYwNAYJKoZIhvcNAQkBFidzdXBwb3J0LXRlYW1AZGlnaXRhbHJlZmxlY3Rp b25wYW5lbC5jb20wHhcNMTgwMjE1MDAwMDAwWhcNMTkwNjIwMTIwMDAwWjAwMQsw CQYDVQQGEwJVUzEhMB8GA1UEAwwYcmVkaXJlY3Qtc2FuLm1vemlsbGEub3JnMIIB IjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAs/4qrMhyJy7n02F7syaacfqk HY49b36V06IpsBB7kgzK95TqB6ubPVuAzJ14HGXdTYd9nQdr5Olyw3tGqYhoS2to 5mBZU8tJfEfnVCUNN80D0wWG/gv721ff9CBh0qq4wFPZDgHVxY8syxxLMUBIpsoT ABBQQa7GbuC+ZefyY/Nfqa0CNlrlgS9s2g1eSSBb5eG5l5oLg2z2LwMb7WlRRzd1 e51FirSlj8FLvVa16WEkaXbFGk+GD97gzvyu+51m/PaXGHSgZxEIgHW5VfSaYCal SZq941og/pw2j8x0O98nVTiWV+bftzAU2xxnH1E3lnXhEy8x7GNn7oHqRPAIkQID AQABo4IFqDCCBaQwggWgBgNVHREEggWXMIIFk4IYcmVkaXJlY3Qtc2FuLm1vemls bGEub3JnghN0aGVvcGVuc3RhbmRhcmQubmV0ghhtaXhlZHJlYWxpdHkubW96aWxs YS5vcmeCEWFpcm1vLm1vemlsbGEub3Jngg9ienIubW96aWxsYS5vcmeCFnZpZGVv cy1jZG4ubW96aWxsYS5uZXSCFXRsc2NhbmFyeS5tb3ppbGxhLm9yZ4IabW9iaWxl cGFydG5lcnMubW96aWxsYS5vcmeCFWxlYW5kYXRhcHJhY3RpY2VzLm9yZ4IOZ2V0 ZmlyZWZveC5jb22CEmFkZG9ucy5tb3ppbGxhLmNvbYILbW96aWxsYS5jb22CEnN0 YXRpYy5tb3ppbGxhLmNvbYISdGhlaHViLm1vemlsbGEuY29tghNtb3p0cmFwLm1v emlsbGEub3Jnghdwb250b29uLm1vemlsbGFsYWJzLmNvbYIPZG50Lm1vemlsbGEu b3Jngg90cmFja2VydGVzdC5vcmeCFXdlYndld2FudC5tb3ppbGxhLm9yZ4IbbWFz dGVyZmlyZWZveG9zLm1vemlsbGEub3JnghNjb250ZW50Lm1vemlsbGEub3JnghFp bnB1dC5tb3ppbGxhLm9yZ4IUbW96aWxsYS1wb2RjYXN0cy5vcmeCDm1vemlsbGEu b3JnLnVrghd3d3cudGhlb3BlbnN0YW5kYXJkLm5ldIIPc3NvLm1vemlsbGEuY29t ghR3d3cucHVibGljc3VmZml4Lm9yZ4IWYWZmaWxpYXRlcy5tb3ppbGxhLm9yZ4IT ZnJpZW5kcy5tb3ppbGxhLm9yZ4Ibd2Vic2l0ZS1hcmNoaXZlLm1vemlsbGEub3Jn ghd3d3ctYXJjaGl2ZS5tb3ppbGxhLm9yZ4IPd3d3LmZpcmVmb3guY29tghJhdXJv cmEubW96aWxsYS5vcmeCEGpvaW4ubW96aWxsYS5vcmeCEGl0aXNhdHJhY2tlci5v cmeCGXd3dy5sZWFuZGF0YXByYWN0aWNlcy5vcmeCEWlucHV0Lm1vemlsbGEuY29t ghBpdGlzYXRyYWNrZXIuY29tghJmb3J1bXMubW96aWxsYS5vcmeCFWxlYW5kYXRh cHJhY3RpY2VzLmNvbYIWb25lYW5kZG9uZS5tb3ppbGxhLm9yZ4IScGxhbmV0Lm1v emlsbGEub3Jnghtwcm9kdWN0LWRldGFpbHMubW96aWxsYS5vcmeCEGJldGEubW96 aWxsYS5vcmeCEG9wZW5zdGFuZGFyZC5jb22CFHd3dy5vcGVuc3RhbmRhcmQuY29t ghR3d3cub3BlbnN0YW5kYXJkLm9yZ4IQb3BlbnN0YW5kYXJkLm9yZ4IXYWN0aXZh dGlvbnMubW96aWxsYS5vcmeCEmZpcmVmb3hxdWFudHVtLmNvbYIaZGVzaWdubGFu Z3VhZ2UubW96aWxsYS5vcmeCEnZpZGVvcy5tb3ppbGxhLm9yZ4ITY2FyZWVycy5t b3ppbGxhLmNvbYISY29udHJpYnV0ZWpzb24ub3JnghVtZXRyaWNzZ3JhcGhpY3Nq cy5vcmeCD3Rhc2tjbHVzdGVyLm5ldIIXYWN0aXZhdGlvbnMubW96aWxsYS5jb22C EHB1YmxpY3N1ZmZpeC5vcmeCE25pZ2h0bHkubW96aWxsYS5vcmeCEnd3dy5nZXRm aXJlZm94LmNvbYIZd3d3LmxlYW5kYXRhcHJhY3RpY2VzLmNvbYIYb3BlbnN0YW5k YXJkLm1vemlsbGEub3JnggxidWd6aWxsYS5vcmeCD2Fzay5tb3ppbGxhLm9yZ4IQ d3d3LmJ1Z3ppbGxhLm9yZ4ILZmlyZWZveC5jb22CD2dpdC5tb3ppbGxhLm9yZ4IP d3d3Lm1vemlsbGEuY29tMA0GCSqGSIb3DQEBCwUAA4GBAGcfQep7MEWxUVvu6WkH Bya8nXChDoR6o1REuCRDxoZa5e3kQb8ZbPHkmEo8ZjE44pS9Z6qUdf28dYzYCjMi WeZ8R9Y/lzynroF+SzbhuRd3vilLtLBg18/eeH/jaWkr5g9mO90U6NrmBF17yiLM Fm+1pyBzcbJ/0/YqqnSwk9Br

thanks this issue seems to be caused by the "digital reflection panel" software on your system that is intercepting & listening into all secure connections. please try to uninstall it.

That software is getting me $50 a quarter, so I think I will stick with my Chrome browser unless there is a workaround for Firefox.

@MikeCody, if your not willing to follow the help no one is going to give you help here.

When the help involves disabling a software product that works with all other browsers, that is an indictment of Firefox, and not too helpful at all.