Fujifilm X100 Mode D'Emploi

If you press the command dial down when a panorama is 
displayed full frame, the camera will play back the picture 
from left to right or from bottom to top. Press the command 
dial down to pause and resume playback, or press the dial 
up to return to full-frame playback. To rewind or advance 
one frame at a time, press the command dial left or right while playback is paused.