Mozilla recently launched a new feature in Firefox Labs – "Link Preview." This feature aims to improve browsing experience by allowing users to quickly understand the content of a link without opening a new page, using a simple mouse operation. With the feature enabled, users only need to hold down the Shift and Alt keys and hover their mouse over any link to have a preview card pop up. The card displays the page title, a short description, images, estimated reading time, and three automatically generated summary points.