Hey there!

There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own. 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 Websites don't load - troubleshoot and fix error messages http://kb.mozillazine.org/Error_loading_websites What do the security warning codes mean

Hope I helped!

Kind regards,

Bithiah

. . . . & now some websites that I used frequently say access denied

What is/are the exact error message(s) ?

Please provide a public link (no password) that we can check out. No Personal Information Please !

reference #18.6c2017.1629233673.2f736c0d example: I can get on to Lowes site, but when I click on a for instance a bag of gravel I get the access denied telling me I don't have permission to access http://www.lowes.com/pd/QUIKRETE-50-cu-ft-Gravel/3510932? on this server. I have a Dell desktop Windows 10/with Norton 360 security

You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data for that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data for that website will be saved once again.

• https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox