Firefox Elementary has been under heavy development for the past weeks and it finally reached version 3.0 today. This version brings a toolbar button - Nautilus Elementary style, a new tab bar with bookmark and history button, full personas support and a lot more:
You can still access the old Firefox menu by holding the ALT key.
If something looks out of place, it means you'll have to customize the toolbars and re-arrange the elements exactly like in the above screenshot (that's pretty easy).
Download @ DeviantArt
As usual, thanks to Thomas for the tip!