Hi, is this your Comcast/Xfinity mail? Do you get a page with a connection error indicating "SEC_ERROR_REVOKED_CERTIFICATE" on an address at '''idm.xfinity''.''com''' ? We had several reports of this on Friday. It appears that someone at Xfinity forgot to update the certificate on that server. Firefox may be the last browser that does a real-time check for whether a site certificate has been revoked, so it is the first affected by this kind of problem. Firefox doesn't have a way to exempt only one site from this check; it is all sites or no sites. For that reason, if you are okay with checking your email in another browser for a while, that probably is safest, rather than me describing how to turn off certificate revocation checking globally. Let me know what you think.