0.19.1 fills in two things the certificate card and the device list were missing, and quietly fixes a latent race in the link panel.
Certificates
The certificate card now says how a TLS port is talking, not only who it claims to be: the protocol version it negotiated and the cipher it chose, read from the same handshake at no extra cost. It flags an obsolete protocol version and a key exchange with no forward secrecy, and states plainly that this is one server's answer to a single negotiation with your Mac — never the full set it supports.
Devices
A device can now tell you which operating system it runs, shown as a System row in its details. Netfox reads it on demand, behind the same privacy switch as the rest, from what the device states about itself — Apple hardware only, and only when it answers. The same read gives Apple devices a steadier model than their advertised name alone.
Fixes
The link panel could, in rare timing, keep a stale route measurement after the outbound-traffic setting changed, or show one that a newer measurement had already superseded — a latent race, never observed in practice. Both measurements now drop any result whose run has been superseded.