For example, if I search "Mushrooms" in DuckDuckGo and then switch the search engine to Google in the Awesomebar, it should be prefilled with "Mushrooms", so I can quickly do the same search in Google. That said the current search query should be fully selected so that when users don't want to do the same search in a different search engine, they can just start typing and the query would get replaced with what they type.