Scrollbar Lens โดย emvaized

Scrollbar Lens shows a preview of the page when you hover the browser scrollbar on the right side of the screen. It helps to easily see the page as a whole, and quickly jump to any part of it by a simple click. Minimap will be shown only if page height is 2.5 times more than the screen height.

Privacy
This addon doesn't collect any private data. It is fully open source, and you can see the code on Github. It requires access to all urls in order to function properly.