Adblock Plus is a free extension that allows you to - among other things - block annoying ads, disable tracking and block domains known to spread malware. Available for Android, Chrome, Firefox, Internet Explorer, Maxthon, Opera, Safari and Yandex, Adblock Plus uses filters that you choose to block all unwanted elements. Created by Wladimir Palant in 2006, Adblock Plus is an open source project. In 2011, Palant, together with Till Faida, founded Eyeo to make its development sustainable. How does Adblock Plus work? Adblock Plus itself has no functionality; it doesn't block anything until you "tell" it what to block by adding external filter lists. Filter lists are essentially an extensive set of rules that tell Adblock Plus which elements of a website to block. You can add any filter list you want. For example, block tracking or malware. You can also create your own filter lists. Almost all filters are open source, therefore many filter lists have been created by Internet users.