Duplicate Tabs Rated 1 out of 5 stars

I agree with Mike Clark below. This is simply an automatic drop down button on most browsers under either file or edit. Why make this so complicated?

Duplicate Tabs Rated 1 out of 5 stars

I simply want to know how to duplicate a tab on Firefox. Maybe the duplicate tab AAP 'icon' might do it. But first I need some more info on how to use this icon ?