I subscribe to "Gizmo Freeeware" & today it presented an ad blocker that appears to be an alternative and/or an addition to "AdBlock Plus". Please note that i haven't tried this program & cannot substantiate any claims.
http://www.techsupportalert.com/con...-efficiently-blocks-ads-using-less-memory.htm
http://www.techsupportalert.com/con...-efficiently-blocks-ads-using-less-memory.htm