I have Firefox on my desktop and notebook and haven't changed any settings re the search engines. So when I'm in Switzerland it automatically goes to "Google.ch" and when I'm in Germany its "Google.de" needles to say, when I was in South Africa last week it went to "Google.co.za". It doesnt matter which Google you use, they all work the same as long as you have the first little circle next to "search the web" checked.