All of a sudden FF is refusing to resolve web sites I've been using for years, like Reddit and my ISP (iinet). All of a sudden they've all got bad certificates (SEC_ERROR_UNKNOWN_ISSUER). It can't be right, I'm not talking about a lot of sites, all at once, all at the same time. Something is broken. For example, https://webmail.iinet.net.au/ is not dodgy, it's my ISP (part of the TPG group, second biggest in Australia, been around for many years). And since I can't access email I won't necessarily know when you've responded.