Ok Firefox.

Somehow you decided to disable keywords and it took me a few days to remember how to fix this.
No more. Never again. And for all the other folks this happens to, all you need to do is:
- Open about:config
- type ‘keyword’ in the search bar
- double click keyword.enabled so it reads true
Then rejoice as things work as expected again. If you’re looking for a great entry for keyword.URL, use YubNub - you’ll never look back.