The resulting search shows up in the search UI, whether you have firefox configured for a seperate search bar or have their default of the address bar also being the search bar. This is the same as the extension method.

If your complaint is that they also show up in bookmarks, then ehh, whatever. Most people either don't use bookmarks or have a giant dumping pile. If you're one of the 1% that organizes them, just put all your search bookmarks in their own folder.