Visual realtime CSS specificity calculator?

I have seen some online css specificity calculators but you have to upload the css files and do some manual work for it to do its work.

Is there a visual one like maybe a Firebug extension where when you click or hover over an element, it calculates it right t开发者_开发问答here in real time?

You can MRI:

MRI is a free cross browser tool that lets you test selectors with any web page. Selectors, particularly complex ones can be difficult to get exactly right - MRI lets you experiment with them on any web page (local or online, static or dynamic).