I know there is an extension called Dust-Me Selectors for Firefox and also that it doesn\'t look at dynamic HTML generated by JavaScript.
I\'m looking for tool(s) th
I think that http://unused-css.com will do exactly what you want.
https://github.com/geuis/helium-css can help
as well as: http://razorfast.com/2010/11/21/announcing-cssess-the-bookmarklet-that-finds-unused-css-selectors/