Advertising on the World Wide Web is increasingly becoming problematic. In addition to merely being a nuisance, advertisements may also pose a threat to user security. Blocking web advertisements can thus substantially improve the user's browsing experience. AdBlock is an open-source plugin for Mozilla browsers that uses regular expressions, an advanced concept unfamiliar to novice users, to block a limited number of HTML elements. This paper describes some of AdBlock's shortcomings and the remedies implemented: automatically generating regular expressions, allowing for web updates, and vastly extending the set of blockable elements.
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