Simple search widget with keyword search engine selection

I want a very simple search widget that passively sits there as I enter my search query, only responding to perform the search when the enter button is pressed. I want to prefix the query with one or more keywords signifying which search engine to use. I want to type in 'w peaches' to search for peaches on wikipedia and 'w g peaches' to search for peaches on wikipedia and google (opening two tabs).

This would greatly improve my phone. It is a must have feature in any modern browser, exposing it via a long press of the search button would not go amiss.

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