Rated 4 out of 5 stars

This was a brilliant extension, and I understand a Web Extension is in the works - although not ready yet. It really cannot come soon enough. Lost without it :(

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

WebExtensions is still impossible without changes from Firefox side:
https://github.com/Infocatcher/Private_Tab_WE#issues