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I want to make Opera behave like Firefox, i.e. search in local history / bookmarks, but not search online, sending addresses i type to the internets.

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The are different types of "suggestions/autocompletions":

  • Server Name Completion

    If enabled, Opera tries to complete the typed in domain name (after pressing enter) by a prefix (per default www.) and a TLD (e.g. .com, .net etc.). So if you type into the address bar asdfg/ (the slash is important) you probably will be directed to -- or if there's no DNS entry, Opera will try

    Configuration via Preferences -> Advanced -> Network -> Server Name Completion or via various opera:config entried (search for HostName)

  • Addressbar Inline Completion

    "Automatic completion of previously typed addresses in the address field" (Opera Help)

    Controlled by opera:config#UserPrefs|AddressbarInlineAutoCompletion

  • Addressbar Search Suggestions

    While you are typing, Opera sends the query to a search engine (per default that's G**gle) to make suggestions what you possibly are looking for.

    Controlled by opera:config#UserPrefs|ShowSearchSuggestionsInAddressfieldDropdown

For those who never came across it, you can simply copy & paste these opera:config... URL's into the address bar and you'll end up at the correct position in the configuration list. Don't forget to press save after changing some options!

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I actually meant proposals for address while typing, not authomatically adding something after enter is pressed. – Smit Johnth Mar 6 '13 at 21:07
@SmitJohnth: Sorry, you need to be more precise. If you don't want addresses to be completed, disable opera:config#UserPrefs|AddressbarInlineAutoCompletion. But also with that enabled nothing is "sent to the internet" either. I guess that you don't want "search suggestion" -- that topic I addressed in the first part of my answer. – mpy Mar 6 '13 at 21:18
@SmitJohnth: I'll edit my answer to be more precise myself ;)... – mpy Mar 6 '13 at 21:33
>@SmitJohnth: Sorry, you need to be more precise.< -> >behave like Firefox, i.e. search in local history / bookmarks, but not search online, sending addresses i type to the internets.< Leaking addresses I type is what I want to prevent. – Smit Johnth Mar 6 '13 at 23:33
@SmitJohnth: Then disabling "Addressbar Search Suggestions" will comfort you, I suppose. – mpy Mar 7 '13 at 0:25

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