And even more critical, it doesn't reroute DNS queries, the default is "don't redirect DNS" in Firefox and the change must be done through about:config there's no dialog.
Bad the default isn't different when using socks :(
If you're using a protocol that sits on TCP and you push it over SSH sitting on TCP then it's going to be TCP-over-TCP. Or in other words, for the vast majority of use cases, no.