Are bell peppers with brown seeds safe to eat?
A quick google brought this:


  In this case, the brown ones may have been closest to mature or
  viable. When fully ripe, most peppers seeds are supposed to be brown
  or tan. not white.


In my experience, peppers with brown are just old and withered.  They are safe, just not as tasty.  Unless the brown thing is mold, in which case they may be poisonous.