The Navigation popups gadget allows easier access to several Wikipedia features as "popups" which appear when you hover the mouse over links. With this useful tool, when you hover your mouse cursor over a wikilink you can see a preview of the article or image; plus you can activate convenient functions such as going directly to the talk, edit, or history pages.
To use the navigation popups gadget you must be logged in under your own user account and turn on the gadget in your Preferences, available at the top right of your screen. In your preferences you will find navigation popups under Gadgets, Browsing gadgets. Full instructions are on the Navigation popups page.