Re: when a open firefox I have FB for my startpage but it redirect me allthe time to this /check6only.facebook.comajax/v6.php?v=check6only&pingonly=false ,
It sounds like Babylon has been installed on your computer. This program can interfere with search and lots of other stuff. I'd try using Firefox Reset to fix the problem. It's a super simple solution that solves a ton of issue.