With a simple mouse-over you can enlarge and display images/videos from links. Now with optional permissions, more features.

An expandable set of rules for getting the larger image, media or other content.
It has more than 200 rules by default, which support thousands of sites across the web, including the popular ones such as Reddit/Imgur, Wikipedia (or any WikiMedia based site), deviantART, Google services (Images, YouTube, G+, Picasa...), Facebook, Twitter, Flickr...

https://www.reddit.com/r/imagus/
https://github.com/TheFantasticWarrior/chrome-extension-imagus