> This add-on only moves the new opened tab to the last position on click.

This extension moves *any tab* you activate to the end of the tab bar for that window. That is *exactly* what the person who requested this add-on to be created wanted it to do, and what it says in the description.

> Serves no purpose.

It may not be useful for you, just as it is not useful to me, but why did you even install it? What were *you* looking for?