Orfox's UserAgent different than other TBB
Currently, TBB use Windows UA as a default.
(tested with latest TBB, if I'm a mistake correct me with latest data.) Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Firefox/38.0
However, Orfox use Android itself. Mozilla/5.0 (Android; Mobile; rv:38.0) Gecko/38.0 Firefox/38.0
Even Orfox is for Android smartphone, I think Orfox should use default TBB's UA for anti-fingerprint.