When an ad banner appears, there's usually a little X in the top right corner to close it.
The X Finder plug-in does not try to identify ads as ads; it internally takes a screenshot and looks for little isolated X's (within the region of your open browser window), then superimposes little numbers "1", "2", "3" on the actual screen. The user presses predesignated hotkeys to simulate a mouse click on whichever close box.
This is much faster than the seconds it takes to move the mouse to that precise tiny region before clicking (the time during which they hope you'll subconsiously absorb the ad).-- phundug, Jan 11 2013 Ad Block http://adblockplus.org/en/chromeWould be better if it replaced ads with bold faced uppercase swearwords [Brian the Painter, Jan 12 2013] Ah, ad banners... I remember them from last decade.-- pocmloc, Jan 11 2013 Don't you use Youtube?-- phundug, Jan 11 2013 Not sure what pocmloc is saying there either. Banner ads are still ubiquitous online. Although it is possible he's found a solution for them by using some sort of software for the last several years.-- rcarty, Jan 12 2013 See Brian Slink.-- pocmloc, Jan 12 2013 Or, assign the job to the keyboard's key 'X'.-- Inyuki, Jan 12 2013 random, halfbakery