The preview is shown while a link to a SE question or SE answer is hovered (the mouse cursor shouldn't move for at least 200ms). Also when hovering "# answers" block on the left in question list on SE sites.

To disable it press and hold any modifier key like Ctrl, Alt, Shift etc. ^{TODO: add an option to reverse the behavior so that the preview is shown only while a modifier is held.}

The preview can be "pinned" by quickly moving mouse cursor over it. ^{TODO: add a pin button and a persistent mode for wide screens with the main page content shifted to the left.}

Esc key closes the preview if it's focused via clicking or right after it's shown.

The preview may be resized by clicking its top border

Questions with answers have a shelf on the bottom with links to the answers. Clicking such an answer link replaces the preview. Clicking the preview title goes back to the question.

Inside the preview clicking a link to SE content will replace the preview, such links are underlined.

The data is cached internally for at least a minute for today's posts, more for the older ones. ^{TODO: add a button to refresh the preview or do it automatically when the title/answer link is clicked.}