| http://www.w3.org/ns/prov#value | - <p>The <a class=" link-https" href="https://addons.mozilla.org/en-US/firefox/addon/1843" title="https://addons.mozilla.org/en-US/firefox/addon/1843">Firebug</a> extension includes pretty much all tools mentioned so far, but it's mostly focused on web development.
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