First seen in 2010, Webmaster & SEO. This page records what the extension did, whether it is still available, and what to use instead.
What it was
A cut down port of the Firefox Web Developer toolbar: disable styles, outline elements, view page information, resize the window. Chris Pederick's official Web Developer extension for Chrome superseded it and is still maintained.
Succeeded by Web Developer
The earlier extension is gone, but its role is filled today by Web Developer, with 1M users and a 4.3 rating. See its statistics and history.
Current alternatives
The most used extensions with "web developer" in their name today.
