Rated 4 out of 5 stars

Do you have any option to restore a closed private tab? I don't see it in the right click menu.

This review is for a previous version of the add-on (0.1.7.3.1-signed). 

Unfortunately no, due to recent changes in Firefox "Session Restore" component.
See https://github.com/Infocatcher/Private_Tab/issues/146
and my reply here: https://addons.mozilla.org/addon/private-tab/reviews/614440/