This is one of the most underrated extensions I've ever some across. It's a swiss army knife of extensions with actions customized for whois, translations, personal IP Info (good if you're on a VPN and want to verify), Video Converter and so much more, including any site that allows direct queries via URL.
The possibilities are endless. If you're a poweruser this is a must-have.
After installing, right-click to see all the services and sites available to you - including the ability to add your own.