Wikipedia:Tools/Navigation popups

Navigation popups Icon
Navigation popups in action. In this screenshot, the user is hovering the mouse over a link to the encyclopedia article.
An example of Page Previews, which is NOT the same as this tool called Navigation popups.

Navigation popups is an opt-in Wikipedia feature (gadget) that offers easy access to article previews and several Wikipedia functions in popup windows which appear when you hover the cursor over links. It should not be confused with the default Page Previews and Reference Tooltips, which are more reader-focused popups seen by all anonymous and new users.

If you're having trouble, you may like to peruse some frequently asked questions.