The Web Developer extension adds a toolbar button to the browser with various web developer tools. This is the official port of the Web Developer extension for Firefox. -------------------- The best place for support is not in the reviews section below, but on the Web Developer site in the help: https://chrispederick.com/work/web-developer/help/ Also available there are a full set of release notes: https://chrispederick.com/work/web-developer/history/chrome/