This is by far the best auto-scroller for Firefox. I read a lot of books on websites that have infinite scroll where getting to the end of the chapter automatically loads in the next chapter underneath and this add-on helps immensely. User-friendly, simple in function, yet highly customizable. I've tried almost all of the other auto-scrolling add-ons on here and as I stated at the start of this review, this one's hands down the best. At the time of writing this review it beats all the other ones by more than a mile. Happy reading folks! :)