Adblock Plus, the #1 most popular browser extension for blocking annoying online advertisements, today announced that it has doubled the number of tracking filters in its EasyPrivacy block list in order to expand its usefulness as a do-not-track privacy tool. Adblock Plus is known primarily as an ad-blocking tool, built upon a series of open-source, volunteer-maintained filter lists which must constantly evolve to respond to new ad formats and delivery methods.