[dolske]

Hindsight is 20/20, but when the wontfix decision was made it wasn't clear that there was significant impact beyond the one addon which reported it -- which had already implemented and shipped a simple workaround -- and the missing file had been missing for nearly 2 months on beta. This was just a few days before shipping already-final code to hundreds of millions of people, which isn't a time to be taking changes lightly. (And as a fun hindsight-in-hindsight twist, it now turns out the millions-of-users addons wasn't actually as badly broken as described.)

It all worked out ok in the end, and could have taken a much better path, but it's not as egregious an issue as you make it out to be. A mistake was made, and it got fixed as soon as we realized it was a mistake.