The free Thumbnail Zoom Plus add-on for Firefox shows the full image when you hover over a thumbnail or image link.
Supported sites include Amazon, Bing, Facebook, Flickr, Google, IMDb, LinkedIn, Netflix, Pinterest, Reddit, Tumblr, Twitter, Yandex.ru, YouTube, Wikipedia, WordPress, Yahoo Images, and many more.
The extension is not compatible with Firefox 57. It still works on XUL-based Firefox forks like Waterfox and Pale Moon
Why can't Thumbnail Zoom PLUS be written to work with Google Chrome? I've tried EVERY one of the alternatives to Thumbnail Zoom Plus for Chrome, BUT NONE work like Thumbnail Zoom Plus! I use Chrome as my main browser because of its speed, BUT for too many pages where I need to zoom thumbnails to be able to see them( I'm 74 years old with poor eyesight), I have to use Firefox because Thumbnail Zoom Plus works on the pages I need it with Firefox BUT not with Chrome.
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