For example, I want to have Duckduckgo in the address bar, and Google in the search bar. Is there a way to do this? I know in both bars there is the option "This time search with:" that is good and all, but is there a way to make it permanatly one of those options depending on the search or address bar? If not, I would like to recommended Firefox adds this, as I think it would be very useful for many users.

Thanks.