FireFilter is a small FireFox extension that efficiently blocks content (advertisements, pop-ups, pornography, etc.) from being downloaded and displayed in your browser. FireFilter blocks content based on rules that you or others create. These rules are called "Content Filters" and can be as simple as single text words or as complex as Regular Expressions. Content Filters are stored in the same way FireFox stores your Bookmarks, History, and Downloads - as a RDF Datastore. This method
of storage is vastly superior to a simple text file in speed and capability.