For me, FF shows matches from History first (they have a little clock icon), followed by search results (which aren't from GOOG if you have switched your defaul

For me, FF shows matches from History first (they have a little clock icon), followed by search results (which aren't from GOOG if you have switched your default search engine to something else, mine are all 'search with DuckDuckGo'), followed by 'Firefox Suggest' which looks to be bookmarks that somehow match whatever I typed in the location bar, at least for me.