It's mostly useless now with everyone defaulting to HTTPS unless you install a root certificate on all your devices.
With some additional duct tape[1] I made privoxy work on https too. I run an instance for each host, though it could be possible to distribute a personal CA certificate.
[1]: https://maxwell.ydns.eu/git/rnhmjoj/privoxy-tls
It's mostly useless now with everyone defaulting to HTTPS unless you install a root certificate on all your devices.