The Web Developer Extension is one, if not the, best reason to use the Firefox web browser. Huge respect to Chris Pederick for creating one of the single most useful tools for Web Developers, ever. If I had to name favourite features, I'd mention the outlining of block level elements and table cells, view source in a new tab rather than a new window, view response headers, and the links to validation tools from the W3C and others.
2 Other Reviews, by... martinp drewp
Tags: css developer development extension firefox toolbar web
See Also: https://addons.mozilla.org/firefox/60/
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