Rated 3 out of 5 stars

per Firefox user e5920a el gen. 21, 2018 ·

please update T_T

This review is for a previous version of the add-on (0.2.2). 

per Infocatcher (desenvolupador) a gen. 21, 2018 ·

Not possible without changes from Firefox side:
https://github.com/Infocatcher/Private_Tab_WE#issues