Rated 4 out of 5 stars
Could you please please make it possible to have a scrollbar on both sides of the page? I am handi-capped and this would make using the internet much more bearable. Furthermore I'll donate $100 to the cause if you do. :)This review is for a previous version of the add-on (1.0.8).
I'm afraid Mozilla never intended to have such features. There is no way to have two vertical scrollbars on the same page. It is only possible to have one scrollbar on the left or on the right.
Scrollbars were not further developped for years now and I doubt this will change in the next years.