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The best validator plugin Rated 5 out of 5 stars
This is a great plugin. At-a-glance you know when something's valid or not. If it could be updated to work with Firefox 5.0 on OS X that'd be great. Thanks!
Tom at htmlpedia's forum has updated this plugin to work with the Mac OS X version of Firefox 5.0. The forum post can be found here:
And the updated plugin can be downloaded here: