Rated 1 out of 5 stars

per Teth el mai. 3, 2018 ·

No support for the new Firefox.

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

per Infocatcher (desenvolupador) a mai. 6, 2018 ·

Still not possible without changes from Firefox side:
https://github.com/Infocatcher/Private_Tab_WE#issues
Sorry. :(