Hover Zoom+ is an open-source, free browser extension for Chrome and other browsers. It provides users with a feature which lets them view an image or video in a full-screen mode without having to click on any links or buttons. It will display a magnifying glass as soon as the user mouses over the image/video. In addition to that, it provides the choice to open a new tab.

You can use it with all websites that support it, including Facebook, Amazon, and many others. You don't need any special permissions when using the extension, and there are no fees.