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alt-p -> advanced -> network > server name completion.
That will control which tlds opera checks and in what order.
It is quite handy - I have used it daily for almost 10 years now...
Same thing as control-enter over a url in IE (which also works in opera)
but alot of disadvantages to opera users
I see only advantages.
Don't forget you can also set up keywords in Opera and Firefox, to go straight to sites by just typing in a word you choose. Eg: "456" for the site 456 Berea Street.
You can change these preferences
Preferences (alt + p) > Advanced > Network > Server Name Completion
I beleive in FireFox, the default settings are to search for the query using google, in a similar fashion as the "I'm Feeling Lucky" Feature, hence the difference in results