The add-on worked as expected.
Since it is a very simple add-on, there were no extra features to rave about.
It does exactly what it is suppose to do.
It provides a way to duplicate any chosen Tab in Firefox browser from a (right-click) context menu.
I specifically chose this add-on because of the context menu entry option.
Some other add-ons of this kind do not offer that option.
This add-on is reliable and simple to use.
I use it countless times a day.
I will continue to use it in both of my PC's, indefinitely.
I would recommend Duplicate in Tab Context Menu to anyone who finds they need to load a duplicate of a web-page they already have open, for one reason or another, and want to use the context menu option to do this.
It's a simple, invaluable, easy to use add-on.
Thanks to those that created this extension!