Clarification on earlier post comments:
The following remarks only apply if you are training alone (i.e. w/o spotters).
If you are front squatting inside a power rack (a.k.a. "squat cage"), then by placing the pins/rods just below your bottom position in the front squat will make it easy to merely drop/set the loaded bar on these low pins if you can't rise out of the "hole" on your last rep(s). Under these conditions crossing/folding ones' arms over the chest to support the loaded bar in front of the sternum is O.K./safe.
There are some powerlifters/BBers whose arms/forearms are so thick that it is most uncomfortable/near-impossible to flex their arms/wrists sufficently to fix the bar at their shoulders for front squats with their arms held in the "finish clean position". In that case, it is highly recommended to do front squats inside the power rack using the low position pins as described above, or use spotters, for safety.
However, if you are front squatting unassisted outside a power rack and are taking the bar from the squat stands, then holding the bar in the front of the sternum in the "finish clean position" (while trying to hold the elbows as high as possible throughout the lift) is the best/safest way to aid in safely "dumping" the bar forward, if you can't rise out of the hole.
