When trying to access many popular websites with Firefox on my Fedora 43 installation, I am greeted with a security warning page with the SEC_ERROR_UNKNOWN_ISSUER error. For most of these websites I can simply accept and continue, but HSTS-only sites will not permit this. Affected websites include but are not limited to (based on exceptions in the certificates section of Firefox settings): * github.io (many subdomains) * purdue.edu (many subdomains) * iu.edu * ebay.com * cbsnews.com * iwm.org.uk * home.cern * celestrak.org Any help in resolving this is appreciated.