Why should Firefox work like Chrome? They're two separate products, and Firefox offers an explicit search bar for disambiguating searches from addresses. Especially important since 'List' could indeed be a TLD in the near future.
The point of these commands (invented by Opera by the way) is to give you choice what search engine to use while not sacrificing your performance. Google's approach is different: remove choices that might confuse or distract you. Choose what you like.
