There are a ton of validation addons for Firefox and although I use several, I always have to have one particular one installed. It’s called Validaty. It’s nothing spectacular, it just does what it does. Validates (X)HTML.
After you’ve installed the addon here, you need to right click on an empty spot in the menu bar and right click and choose ‘Customize’. Then find Validaty and drag it wherever you want in your toolbar area.
Now whenever you want to check and see if a site validates, just click the button and it will validate against the W3C’s standards. If it validates, you get a green checkmark. If it doesn’t you get a red checkmark with the number of errors. You can then click on it and it will take you directly to the W3C’s website.
Again, nothing new here and there are a ton of other more robust addons that do the same thing, just for some reason this one is the one I prefer.
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