Yes, sorry ...
It installs smallish arrow-buttons in a vertical row on the right of your browser window which, when you simply pass the mouse cursor over, can take you respectively either to top_of_page, scroll-up, scroll-down, previous page, next page, bottom_of_page - then there is the option for other (smallish-) arrow-buttons that appear at each link and when you simply pass the mouse cursor over them, take you to where that link points.
There are two or three others that go to previous_tab, next_tab and close_tab.
Plus various options of transparency, time lag etc.
So what it comes down to is no more clicking etc., just pass the mouse cursor gracefully over a (smallish-) arrow-button and off you go.