View Source Chart a Firefox extention to help figure out HTML layout

While reading through the blogosphere the other day I
stumbled into thisFirefox extension.
In a word it’s “cool”. Rather than the simple View Source command this extention
gives you a View Source Chart command which will take markup and convert it into
something that looks like this:

Hopefully, this makes it pretty clear how really useful this is. Kudos to
Jennifer Madden for this one.