Johnny Stenback (:jst) <jst@mozilla.org> has granted Smaug
<Olli.Pettay@gmail.com>'s request for superreview:
Bug 401559: GetFirst/LastChild doesn't ensure contents generated
https://bugzilla.mozilla.org/show_bug.cgi?id=401559

Attachment 286564: proposed patch
https://bugzilla.mozilla.org/attachment.cgi?id=286564&action=edit