My most-used and possibly favorite plugin has been updated to work with Firefox 5.0 on OS X. HTML Validator by Mark Gueury is a free utility that lets you know at-a-glance when something is valid or not. It can quickly determine the quality of markup and it’s a great first-step to take when troubleshooting cross-browser compatibility issues.
The update was done by Tom at htmlpedia’s forum, and can be directly downloaded here for OS X.
The actual plugin’s page can be found on Mozilla’s site here, but as of the time of this post it hasn’t been updated yet.
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