Focus problem Rated 5 out of 5 stars

I'm confronted to a strange little problem :
If I find myself on a page for which I have log-in credentials and if at the same time I have not logged in to Master Password and disabled notification to do so, then I lose focus of the Web page just as if a hidden notification pop-up was getting that focus. Now at this point I ignore if it is related to my system or not. A bit bothering, moreover if I have another user on the computer and wish that sites for which I have a login be not revealed ...
Has anyone else experienced this issue ?

This review is for a previous version of the add-on (1.16.1).  This user has a previous review of this add-on.