Also Firefox's address bar is much better at searching your history, saving you from doing Google searches. For example you can type the words in the titles of articles you've read and Firefox's AwesomeBar does a good job at suggesting past entries.
This is awesome when you no longer remember the domain or url, but you remember a word or two. In such instances searching on Google doesn't help either.
This feature to me has been an epiphany actually. Google has no interest in developing something like the AwesomeBar, because they'd rather see you doing searches on Google instead.