The specific case I have: I use the URL bar basically as my bookmarks (turned off browsing history and top sites in address bar suggestions), and one of the pages I frequency is https://hackaday.com/blog/ (note that this is distinct from the base https://hackaday.com). In chrome it works fine, if I hit h in the address bar it immediately autocompletes it to the full url, but in firefox it autocompletes it to the base url so I have to hit h then down arrow to get to the site I want.
For the life of me I haven't been able to figure out a way to change the behavior, and it absolutely infuriates me that there is no obvious way to fix it.