makes sense with mouse gestures Rated 4 out of 5 stars

This extension does very nicely what it promises. I use it with mouse gesture (mousewheel left-right). I see no usage for toolbar/statusbar buttons, as all the websites already use their own buttons/links for navigation...
What it lacks most imo is loading the next page by simply scrolling to end of current page. This would only make sense for "forward"...

This review is for a previous version of the add-on (0.9.1). 

I prefer keyboard shortcuts, personally.