mozilla/bedrock — pull request #144 by icaaq (2012-06-03 07:24:00+00:00)
Title: The order of the nav-links has no meaning 

Replaced the ol-element with a ul-element though the ol element represents a list (or sequence) of items; that is, a list in which the items are intentionally ordered, such that changing the order would change the meaning of the list.

http://www.w3.org/TR/html-markup/ol.html