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If you have trouble installing the extension, you need to go to about:config and set xpinstall.signatures.required to false. However in some versions of Firefox it's broken, so if this doesn't work for you, you will either need to switch to a different edition of Firefox, Waterfox, or some other fork that supports WebExtensions.

This might work with earlier Firefox versions, but I've tried roytam1's 45 ESR, regular 48, and regular 49, all of which didn't work.

General Overview: This shows you info about a loaded image in your browser without needing to download it. Just open the context menu, and select View Image Info.

Source extension on Chrome addons store

Modded extension link: Screenshot: The addon as of making this post has no license, so this is fine for me to do.

I may or may not make a dark skeuomorphic version eventually.