Chrome: Wikipedia is a useful tool, but its navigation hasn't changed much over the last few years. WikiTweaks gives you some new options to play around with.
The extension adds a pop-up box when you hover over a link that provides you a summary of the page it links to. It only works within Wikipedia, but that can be very useful on its own, keeping you from diving directly into the rabbit hole of related links. It also removes the side bar so you can get more content in a smaller window area, making research a lot easier.
WikiTweaks [Chrome Web Store]