when visiting a search engine that is part of firefox, firefox should display a non intrusive popup that allows the user to instantly set it as default search engine. it would look something like this. visit duck duck go. a popup appears in the toolbar, itwould ask. make duck duck go your default search engine? yes, or no. this would save a lot of time and means you don't have to dig deep into settings to set it up, especially if you have lots of devices