On the firefox homepage you have a google main bar and a google in top right hand corner provided you have set google as your main search engine. When the firefox page is hijacked only the search in the top right hand corner finds google searches. The main centre page google defaults to a blecko or sweetIm search engine. Appears to be a known problem just search for "get rid of blecko". Malwarebytes, Norton, Spybot and Superantispyware do not get rid of it.