Hi, for about 14 days I get random certificate warnings - even on well known websites. They vary from SSL_ERROR_BAD_CERT_DOMAIN to SEC_ERROR_UNKNOWN_ISSUER... even on websites like x.com or LinkedIn. At the same time I got a new router from my ISP. But I am not sure, if this is connected somehow or if I got a Man-in-the-Middle or a virus. Malwarebytes & Co don´t find anything. I have resetted Firefox, too. But nothing helps. I get these errors in Chrome, too, sometimes. But not as often. Any ideas anybody? TIA!!!