Who blocks the (ad) blockers?

If Danny wishes to block Firefox users who have turned Javascript off, he could use implementation differences in Cascading Style Sheets (CSS). Furthermore, due to a trick discovered by uber Web-application security hacker RSnake, it is possible for Web site designers to figure out exactly which Firefox extensions you are running. This was first reported to the Firefox development team in 2005, but has yet to be fixed.

Read the article HERE.