Rated 5 out of 5 stars

RT

This review is for a previous version of the add-on (0.2.0).  This user has a previous review of this add-on.

See https://github.com/Infocatcher/Private_Tab/issues/237
and https://bugzilla.mozilla.org/show_bug.cgi?id=1318388
So, also should be changed Firefox source code...