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.
Used to be, Firefox would show previously visited sites/pages (arranged by how often you visit them) first.
Now it loads Google search results first and I very often step into them like it's some dogshit on the ground.