In Firefox you right click on a website's search field and select "Add keyword for this search". The you can use "<keyword> whatever you're searching" in the a

In Firefox you right click on a website's search field and select "Add keyword for this search". The you can use "<keyword> whatever you're searching" in the address bar and it will take you right to the results page. It works great but is poorly advertised and not particularly discoverable... They're stored as bookmarks so it should be possible to import them.