Too bad chrome's page actions are now to the right of the url/search box instead of dynamically appearing on the box. I'd like to install this, but I don't want to have the button always be there.
Eek, I misunderstood your previous comment. You can still make extensions that use the omnibox instead of the bar, but the things each can do are very different. It's possible the creator of the extension couldn't do what they needed in the omnibox, or didn't know they could do it :)