Bug 1415104 is a well-understood case where this would happen. I'm not aware of any other situation where this would happen right now, and you said it's not really reproducible. So I think the most useful thing to do with this bug is to make it a dupe.
Bug 1415104 is a well-understood case where this would happen. I'm not aware of any other situation where this would happen right now, and you said it's not really reproducible. So I think the most useful thing to do with this bug is to make it a dupe.