Even I have wrote some of my own search engines that go in the top right box and I'm thick.
From memory - Go to where your Firefox is installed and you should see a directory that refers to 'search'.
I think there are 2 files with nearly the same name and one of them can be edited in Notepad.
Therefore copy the Google and rename Google USA.
Open up in Notepad and change the parameters.
That's how I remember doing it.
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