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myself and others are getting an error 400 message on year01.com website. its fine in chrome and safari. Your technical support key is: 2d48-81c1-582e-c5e4
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There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own.
Websites don't load - troubleshoot and fix error messages
If you use a bookmark to access a specific page then instead navigate to this page starting with the main page or with the sign in page in case there is a problem with this bookmark.
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.