MiddleButtonScroll is a free add-on for Chrome that adds smooth scrolling functionality to the middle button auto-scroll and improves the user interface. With no setup necessary, this add-on brings Firefox-like autoscrolling to Chrome. It provides a seamless scrolling experience and may include the ability to adjust sensitivity in future versions based on user feedback.

Please note that this extension requires Chrome 5.x (beta or dev branch) as there is a bug in the stable branch (4.x) that disables the functionality. Upgrading to the latest version of Chrome is necessary to use MiddleButtonScroll. Additionally, the extension may request access to "Your data on all websites," but it does not actually access any user data. It runs on all pages to enable the scrolling functionality.

MiddleButtonScroll has a history of updates, with the latest versionreleased on December 20, 2010. This update fixed the triggering of events when the mouse button is released. Previous updates have addressed issues related to scroll activation, freezing, icon position, and sensitivity adjustments.

Overall, MiddleButtonScroll is a valuable add-on for Chrome users who prefer smooth scrolling and enhanced functionality for the middle button auto-scroll. It offers a seamless scrolling experience and may further improve with future updates.