For faster startups! Its software acceleration compensates for sub-optimal disk performance to make extensions and control panels load faster.
Smart Scroll
Resizes the indicator thumb in regular scroll bars to show how much of a document is displayed in a window: If a window is displaying half of a document, the thumb will be half the scrollbar size. This gives you an idea of how large the document is, without having to scroll the window to find out!
Smart Scroll also adds Live Scrolling, which updates the display as you drag the scrollbar thumb. Just release the thumb when you see the part of the document you want: no more guessing where you'll end up!
Get these and more from http://www.marcmoini.com or http://www.kagi.com/authors/marc/