The KnowMore extension alerts you when you visit the websites of unethical companies (it also let you know if you're visiting a company with a positive rating!). The extension also mashes KnowMore.org's issue-based icons into major search engines (Google, Yahoo, Live, Ask) and integrates with the Amazon.com catalog.
Google 'American Apparel' to see it in action.
Our goal is to empower consumers to purchase products and support companies that are more in line with their values.
The extension is powered by Knowmore's API and updates the client-side database once every 24 hours.
Please see our Firefox Extension Page for more info. - http://www.knowmore.org/wiki/index.php?title=KnowMore_Firefox_Extension