@l33t4opera: Yes, I know. But Alt+D is the best and easy for me.
And I know a better way is return to Firefox also.

Yes, this thing is really annoying.
I often use Alt+D (on windows) to focus the address bar.
But when I release the D key a bit early. The menu will pop out.
What a bad experience. And it is useless, because all of items in this menu have its own hot key.