Chrome:
https://chrome.google.com/webstore/detail/adblock-plus/cfhdojbkjhnklbpkdaibdccddilifddb
Firefox:
https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/?src=hp-dl-mostpopular
Opera (Blink):
https://addons.opera.com/en/extensions/details/opera-adblock/?display=en-GB
IE:
http://www.softpedia.com/get/Internet/Popup-Ad-Spyware-Blockers/Simple-Adblock.shtml
For IE I am using Adfender although it works with all browsers.
http://www.softpedia.com/get/Internet/Popup-Ad-Spyware-Blockers/AdFender.shtml