Still present in upstream:
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2pre) Gecko/20100109 Ubuntu/10.04 (lucid) Namaroka/3.6pre
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.3a1pre) Gecko/20100109 Ubuntu/10.04 (lucid) Minefield/3.7a1pre
Still present in upstream:
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2pre) Gecko/20100109 Ubuntu/10.04 (lucid) Namaroka/3.6pre
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.3a1pre) Gecko/20100109 Ubuntu/10.04 (lucid) Minefield/3.7a1pre