Imagus

Enlarge thumbnails, and show images/videos from links with a mouse hover.

There are plenty of settings which can be customized, and reviewing them is currently the best way to learn about what the extension is capable of. Sections on the options page that may need explanation: ▪ Sieve An expandable set of site specific and general purpose rules for getting the larger image, media or other content. ▪ Grants List of user defined sites where the extension should and shouldn't work.