I genuinely want to know what you think is the percentage of FF users who type "ai" who intend to go to http://ai and not search for "ai" is. Even better if you can estimate that for all possible single words that are also TLDs. And then tell me why users who might actually want the domains can't just disable search from the address bar which is a feature FF has which is exactly tailored for this use case. And then also tell me what is wrong with having to explicitly specify "http://<whatever TLD>" which works even when the search-from-address feature is enabled.