Hmm, not sure what else you would need.
When searching for a setting to make Firefox work like Chrome, I had found this a while back: https://support.mozilla.org/en-US/questions/1223611
I basically did what was suggested there. (The 2-3 character length I suggested was just from my experience of avoiding collisions with other urls I might visit and was when I wanted to hit return when I started typing.)
Not sure if these settings matter or not. I just tried disabling a few and it doesn't seem to make a difference These are the only ones that seem relevant.
In about:preferences#search I have this enabled:
- Provide search suggestions
- Show search suggestions in address bar results
- Bookmarks