How to remove "ads not by this site" in Firefox.?

Before upgrading to Firefox 11, I noticed big flashy banner ads across the top of my browser. I then installed "Adblockplus" and it blocked the ads, but there's a big gray space still there as if it is designated for the ad banner. I used malwarebytes, Kaspersky Internet Security Scan, Spyware Doctor, and it is still there. I turned off adblock plus, and ads come back, I turn adblock plus On, it blocks, but I still see "ads not by this site" in that gray area for banner (not supposed to be there). So does anyone knowHow the hell can I get rid of this browser hijacker? I even tried uninstalling Firefox completely with an uninstaller like Revo uninstaller to see if it gets rid of it. And then I didn't use firefox for 2 months. I then recently installed Firefox 11, and I still have the same problem. I don't know what it is, but at first my browser home page was hijacked by conduit search. I got rid of that, but I believe there is still left adware of this because recently, I just got a new problem called "Download N' Save" Coupon scheme telling me a new way to save money, this appeared on my Ebay page now and don't see it any other browser except FireSux.
Answer:

Sorry that is not possible.

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