You are soooo close!
- Provide search suggestions
- Show search suggestions in address bar results
In about:preferences#privacy I have this enabled (plus a few other things): - Bookmarks - Bookmark the url
- Go to Bookmarks > Manage Bookmarks > [location of your bookmark]
- In the keywords section, put the first two or three characters (I settled on three) of the domain, so 'hac' in this case
Now when you start typing in the domain and you type those first two or three characters (or however many you want to setup), the first suggestion from firefox will be your keyworded bookmark and you can just hit enter instead of having to hit down!