Scroll Preview is a free Chrome add-on developed by Mike Chen. Designed to enhance page previewing, this add-on integrates a whole-page preview with a scrollbar, inspired by Sublime Text's mini map. With Scroll Preview, users can easily navigate and preview web pages with greater precision.

The add-on offers several key features to enhance the preview experience. Users can activate the preview scrollbar by pressing Alt + A, which provides a rough preview of the entire page. The scrollbar can be dragged or clicked, mimicking the traditional scrolling behavior. For a more refined preview, users can press Alt + Shift + A, although this may require some patience.

To make previewing even more convenient, Scroll Preview offers Automatic and Conditional modes, which can be enabled in the options page. These modes eliminate the need for manual key pressing, allowing users to focus on browsing.

In addition to these features, Scroll Preview also includes a variety of other useful functionalities. It captures whole-page snapshots, adds an additional easy-to-drag scrollbar that works seamlessly with the native one, and integrates the snapshot with the scrollbar for better previewing. The add-on also refreshes the snapshot when the window is resized, allows for hide/show toggling, and applies anti-aliasing on the snapshot for improved visual quality.

Scroll Preview also includes a magnifier on the snapshot, which works in conjunction with the click-to-jump feature. Furthermore, it offers an always-on mode and an option page for customization. Users can also take advantage of the auto-hide feature, as well as the blacklist and whitelist functionalities.

Overall, Scroll Preview is a valuable Chrome add-on for those who want to enhance their page previewing experience. With its intuitive features and seamless integration, it provides users with greater control and convenience when navigating web pages.