Seems that way. Either a packaged unit file should be in /usr/lib/systemd/system or maybe a custom one in /etc/systemd/system. I have no privoxy.service in my set up. Does privoxy come with a unit service file? Don't use it myself. You can always create one.
With 'user' option it should mount OK.If you have gvfs installed, you have polkit, so check if the session is active: https://wiki.archlinux.org/index.php/Ge … ermissionsNot sure if https://wiki.archlinux.org/index.php/Xf … le_Devices has any useful info.