Recently an interesting white paper was published
in academia dealing with FAVICONs and how they can track people. This was a decent white paper and would not have made a big headline. However, the actions of the author presented a rather peculiar scenario and shot this white paper on the center of a massive debate.
TL:DR: The author realized Firefox is immune to the attack they were showing however they realized it deviates from standard behaviour. So without disclosing the fact that this behaviour is preventing an attack, they raised an issue to fix the behaviour. If they applied the fix, this would have resulted in Firefox being vulnerable to an attack.