Which Firefox extension checks html markup when you view source?

Posted by Haroldo on Stack Overflow See other posts from Stack Overflow or by Haroldo
Published on 2010-03-17T14:55:21Z Indexed on 2010/03/17 15:01 UTC
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I used to have a great firefox addon for this and i can't remember the name of it..

when you looked at the source it would sit at the bottom (like firebug) and check your html markup and suggest things like "doctype given is html4.0, looks like xhtml strict" etc

i though it was the web developer toolbar but that doesnt seem to add anything to the bottom of ym source pane?

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