Seriously, it’s that good. What Hover Zoom by Romain Vallet does? It ‘simply’ loads the images behind little thumbnails and displays them in an overlay frame.
Sounds simple? I’m sure it isn’t, even more so if you look at the supported sites:
• Amazon • Last.fm • 4chan • Baidu (百度) • MySpace • Reddit • deviantART • Picasa Web Albums • Imgur • eBay • Twitter • Panoramio • Facebook • Wikipedia • Fotolog • Flickr • Windows Live Photos • VKontakte (ВКонтакте) • Google Images • Yahoo • YouTube • Google+ • WordPress
Apart from these officially supported sites, I found Hover Zoom working well for quite a lot of other websites on which it ‘just works’.
The author has done an amazing jobs keeping the extension really simple and unobtrusive, with options for whitelisting certain sites, adjustable delay and fading effects and zoom on keyhold. It even displays captions below the zoomed image if it’s able to catch one. This is the kind of extension that’s hard to describe, but once you’ve installed it you are going to miss it on any browser that doesn’t have it.
Hover Zoom is available from the Chrome Web Store.