Prefix one word searches with a question mark and then space ("? ") will always search in Firefox. Old Power User trick from decades ago even when Firefox still

Prefix one word searches with a question mark and then space ("? ") will always search in Firefox. Old Power User trick from decades ago even when Firefox still had a split search box by default. (There's also search keywords to force it to search with a non-default search provider such as starting a search with "@wikipedia " to search Wikipedia.)