Hi, A bit of an odd one this I think. Have already read all the other threads regarding search problems and pretty sure this isn't the same thing at all. No matter what I type into the URL / search box it first very quickly flashes up with a Google link (which is what I have set in my preferences for Firefox [I'm using the Developer Edition] to use) then it redirects to Yahoo and uses their search instead. I have checked all plugins / extensions in Firefox and there are none installed that would do anything like this. Luckily I was able to halt the browser from performing the redirect so I copied the URL that shows before being redirected to Yahoo. This is the sort of URL that I am getting : https://www.google.com/search?q=dog&ie=utf-8&oe=utf-8&client=firefox-b-ab Notice the &client=firefox-b-ab at the end. If I take that off the end of the URL then it searches as it should do with Google however with me not changing the URL (which happens automatically as soon as I type something in to search) then it redirects to Yahoo which leads me to believe that Google is redirecting Firefox based upon the fact that it is Firefox? Why they would do that is utterly beyond me though? Thanks for any help with this as I'd really love to be able to get back to having Google as my default search engine again as soon as possible. Best wishes, Mark