Rated 4 out of 5 stars

This is one of the most useful add-ons. I quickly miss it when I use other web browsers that do not have this feature.

I do wish there was a way to change the icon for it, particularly when I change the theme of the browser but it keeps the original icon.

This review is for a previous version of the add-on (5.3.2). 

But you can change the icons ...

If you go to Back to Top options > Misc > Open icon editor you will see that you *can* change the appearance (size, color, etc) of the individual icons.