All the errors except for the simpleton error are present in the safe mode startup as well.
Bug 1653789 Comment 1 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
All the errors except for the simpleton error are present in the safe mode startup as well. Well, this is probably because the error of simpleton seems to be caused by async race and may not happen all the time. So I will not deny the possibility this simpleton error happens in safe-mode even.