As the grandparent comment says, you just get used to how Firefox works. For example, I would've never even thought to type "news" to look for hackernews in the omnibar after using it so long-- I just instinctively know that Firefox will find it easier based on domain name, so I type "yc" for "ycombinator.com"

I can see how this is going to be confusing for a new Firefox user, but it's easy to get used to.