You can have it look similar to version 3 with the menu bar rather than the orange box menu - Click the orange Firefox button then hover over Options and click Menu Bar.
hahah I actually like the "orange" menu thing ... gives me more room. Took me a few mins to work out where the "Error Console" had been moved to though,as it was normally under "Tools", which doesn't exist any more =)
I love the "pin" tabs too - very handy (I tend to have a LOT of tabs open ... so having 3 or 4 that's I *always* use as smaller tabs certainly helps to keep things a bit more in check