Don't know the answer to that one. I can say for sure, I had very bad scrolling issues like yours, mine were caused by not yet loading the drivers for my graphics card. I'm not saying that's your problem, but it may be something to look at.
I still prefer IE over Firefox. The main reason is adjusting text size on web pages. I am on the computer all day for work and visit many web sites. It is much less cumbersome to use IE. With IE you can put the "Size" button on your toolbar, click on it and hit "larger". With Firefox, you have to click "View", then "Text Size", then "Increase" and and then repeat all those steps AGAIN if you want to go to a even larger text size. What a hassle! The extension doesn't work with the 1.0 version.