When I type “n”, I’m likely either going to news.google.com or HN. Firefox will guess correctly that I’m thinking of HN and fills that in as the URL. However, the main HN URL and Google News are something like 8 and 9 in the list. Everything above those two is a mix of things that happen to have an “n” somewhere in the URL that I may have recently visited.

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.

Note: this is different b/w the desktop and iOS versions too. The desktop seems to have gradually gotten better as it’s been trained more.

(And I have Firefox sync setup)

Type ‘news’, use the arrow keys to select the offending entry, and hit delete.

Just type news<space>y then until it gets used to it.

(And on a general note: some people here might want to verify they haven't touched the settings;-)