Hi all, I'm having a repeat of this issue: https://support.mozilla.org/en-US/questions/1291551 Again some links from emails have been giving me the "Warning: Potential Security Risk Ahead" page with the error message "SSL_ERROR_BAD_CERT_DOMAIN". I get this in safe mode but not in private browsing. I have tried ''all'' of the fixes suggested last time I asked about this problem including deleting cert9.db but that hasn't worked this time (so maybe it wasn't the fix last time either). To be explicit, I've tried all fixes on these pages so please don't suggest them again without providing an explanation about why you think it will work (a technical explanation please): https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message https://support.mozilla.org/en-US/kb/connection-untrusted-error-message http://kb.mozillazine.org/Error_loading_websites https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors And also this one, which is actually related to the message (none of the above are): https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean#w_ssl-error-bad-cert-domain Some examples of links that I get this message for: https://click.mail10.smallworldlabs.net/ls/click?upn=4FIN3hZFvI-2BP9iq5nue2vk-2BIMF5sm7TLqXM-2BBHmHs4tQjfdaurWm34ztLj9SPiVE4gseyCl-2FaqSWT59ygV9BpAcDzFkriqc5NC2qBiwl5aOaxL8F5mgo-2BFX-2Fgbi7iwZeFhIlJVBY5pUPWQy6owSYMskwXWDY7Y1aaoMS-2BkHbmCPTNSg29Z4JoYD7fjx9bZW5b2-2Fg5dX2SSuZS5csOf3H6IGmB8UNGulRns8j4EzznpinCvgJxocujRrlszMnMzDFaGlZcc-2BWOcJNASuRsaEH6HcXAoqMnLhDAoAdn0UChLWOY-2FfbP2Ib-2FUEDr6NloUbD-2FnHqHVVYd821nihjMp740-2F5x7GMXZmwRiFR7H2o2PqTC4rmR-2BSqxJ-2BuAl15SvxjWYbO9ClP8PSHw5pY80IikJqK10tVO8wFNKUY0vnffi80-3DW8m3_a4b-2FpboTDHPk-2BrdoYKQMvkNzRfSbL-2BRxE8OVpRrBC237mTF3qcpluLuTnfAWEU7fFwhhtOg-2BbDd1pxD5bmCpb3y8948sPEH5oTF-2Fsg1k82R-2Be5SnCvGNogmdD1MB5K11JV0Ow8rxc63etMs7M6GZzfslGWbxLHW9hydaH2RME5RPXqcBAsIRau-2FizQsq15rW5BclijLm23gWXw-2BvlJjO8gxiJ-2BQwpw2wvKihYGT4DKxPTObnz-2Fpn1ua2ng0ah-2BN1xDub-2Bav5GSEDaq4OPiG8JUArfSPtya-2ByoEn6CzLpZaqsLJ5rbTCztuAV25pOmNhojUORS-2Fnyv8FFlz-2Fh4EX6xolAvA1UgOdaXT3xescKfmROnAvFsYyB88QxIKBXi1-2Br Web sites prove their identity via certificates. Firefox does not trust this site because it uses a certificate that is not valid for click.mail10.smallworldlabs.net. The certificate is only valid for the following names: *.sendgrid.net, sendgrid.net Error code: SSL_ERROR_BAD_CERT_DOMAIN https://click.topgear.bbc.com/?qs=c719f0befb99016fe4d64e88dc7ec435f7eee7452916295aaa562fc47d530c91af5900c5d298ac67019e3560abca9b8eab0be3a91e8e632f Firefox does not trust this site because it uses a certificate that is not valid for click.topgear.bbc.com. The certificate is only valid for origin-click.s6.exacttarget.com. Error code: SSL_ERROR_BAD_CERT_DOMAIN Please tell me if you need more info. All helpful suggestions much appreciated. Thanks :)