It's in dropped D tuning.

Intro:
[G-------------------/12-------------------------------
D-------------------------12h14-12-------------------
A--1-2-3---/10---------------------------------------
D--------------------------------------/5-------/17--]

Verse:
[G----------------------------------------------
D---------------------------------------------
A------------3--5-5-5-3h5--------------3------
D---0--3-5-x-------------------0--3-5-x---x-3--]
   ss s s p p p p p     s s s s p s s

Bridge:
Part a
[G--------------------------------------------------
D---------------------------------------15-16-17--
A-------------------------------------------------
D--5-5-3-5-3-5-x-5-3-4-5----5-5-3-5-3-5------------

G------------------------------------------------
D-----------------------------------------------
A-----------------------------------------------
D--5-5-3-5-3-5-x-5-3-4-5----5-5-3-5-3-5--9-10-12-]

Part b:
[G--/12-12----/12------------------------------
D------------------12h14-12------------------
A--------------------------------------------
D--------------------------------/5----7-8-9--]

Break Down:
[G------------------------------------------------------------------
D-----------------------------------------------------------------
A-------------------x-3-5-5-5-3-h-5---------x-3-5-5-5-3h5---------
D------------------------------------0---------------------0-----3-]

leads back into verse