Search engines pay Firefox (and probably other browsers?) to direct traffic to them through the browser search box/awesomebar. I don't know the specifics, but I think a firefox-specific query parameter is included in the searches.
If you want to do this on your own I guess you'd have to make deals with the search companies? I don't think folks will automatically start paying you :)
If you want to do this on your own I guess you'd have to make deals with the search companies? I don't think folks will automatically start paying you :)