... which only works for browsers. What about all the other uses of certificates? TLS itself is used for securing almost every network communication that goes

... which only works for browsers. What about all the other uses of certificates? TLS itself is used for securing almost every network communication that goes over the Internet nowadays, including SMTP (and even DNS with DNS-over-TLS or DoH, ironically). So how does Mozilla notice that a CA misissued a certificate for my SMTP server or my upstream DNS server? (Answer: it doesn't).