Nice extension Rated 5 out of 5 stars
I use YASS on Ubuntu, where the mouse scroll sucks always (and you can't configure it).
YASS seems to be the saver for me using Firefox on Ubuntu. But with the ever sucking 3.7a4, YASS (3.0.13) works not so great. As another user's comment, I can confirm the "bounce back" effect when you scroll rapidly to the top or to the bottom of a page. It's kind of you've discover some gray area and then the browser drag you back.
To me it's trivial so 5 star as always, maybe it's an auto-heal bug in the future.