Dust-Me Selectors is a development tool for Firefox and Opera, that scans your website to find unused CSS selectors.

Scan any HTML page

Dust-Me Selectors will show you details of all the stylesheets and selectors that were found, organised into used and unused selectors. This will tell you what CSS is used on that single page.

Spider an XML or HTML sitemap

Dust-Me Selectors will load and scan every page that's linked from the sitemap, checking every stylesheet it finds against the DOM of every page that includes it. This will give you an accurate picture of site-wide selector use.

Scan pages automatically (Firefox version only)