HTML Body shows cz-shortcut-listen=“true” with Chrome's Developer Tools?

Question

I was testing some HTML code I\'m making, and while using the Developer Tools on Google Chrome version 22.0.1229.94 m, I saw the tag has the attrib

Answer 1

It's being added by the Colorzilla browser extension.

https://twitter.com/brianpemberton/status/201455628143689728