A barra de endereços do Firefox é chamada de "Awesome Bar" e sob esse nome você pode encontrar algumas informações sobre seus recursos.
Pouco trecho do site de suporte do Firefox :
Add ^ to search for matches in your browsing history. Add * to search for matches in your bookmarks. Add + to search for matches in pages you've tagged. Add % to search for matches in your currently open tabs. Add ~ to search for matches in pages you've typed. Add # to search for matches in page titles. Add @ to search for matches in web addresses (URLs). Add $ to search for matches in suggestions.