What do I do if Firefox wont let me log into my account on a website because the "certificate has been revoked"? I think it has to do with the "enhanced tracking protection" setting. This is what the advanced message is: Be careful. Something doesn’t look right. Firefox spotted a potentially serious security issue with digital.bluefcu.com. Someone pretending to be the site could try to steal things like credit card info, passwords, or emails. Advanced What makes the site look dangerous? Firefox is warning you about this site because the certificate provided for digital.bluefcu.com has been revoked and isn’t trusted anymore.