As you'll see, this bug is marked as private (at least as of writing this comment). So, as a matter of fact, it does not appear that even the most diligent user had the option of reviewing what's going on. So far, it has not even been disclosed who among the Firefox peers signed off on this change; that information appears to be private as well.
https://bugzilla.mozilla.org/show_bug.cgi?id=1423003
As you'll see, this bug is marked as private (at least as of writing this comment). So, as a matter of fact, it does not appear that even the most diligent user had the option of reviewing what's going on. So far, it has not even been disclosed who among the Firefox peers signed off on this change; that information appears to be private as well.