Rated 5 out of 5 stars

That's a great suggestion. Thanks! I wish the Often Used With section contained this useful information...

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

Rated 5 out of 5 stars

I use this addon together with Redirector addon, to create site-specific private browsing. I set the Redirector to convert, say, http*://*google.com* automatically to private:http$1://$2google.com$3 using wildcard expression. This way, any google open I click goes into private browsing. The only problem is that this addon strips the private: prefix when done, causing the Redirector to fire up again, leading into a perpetual loop.

Right now, I have to get creative and append non-consequential characters to the URL to avoid this problem. I wonder if the addon should have an option to keep the private: prefix in the address bar. If not, is there a hack? I don't mean unzipping and so on.

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

Oh, looks like this is how Redirector works (and may be fixed only in Redirector side)...

But you can try Auto Private extension:
https://addons.mozilla.org/addon/auto-private/
( and https://github.com/Infocatcher/Private_Tab/issues/100 )

P.S. Also "private:" prefix may break many other things, that's why used a sort of redirection. For example, https://github.com/Infocatcher/Private_Tab/issues/144