How do I disable Xfire Game Statistics tracking?
From the Xfire client, go to Tools | Options | Privacy tab. Uncheck the checkbox for “Track Kill/Death stats for display on Profile”. You can also go to Tools | Options | Games tab, under the Installed list highlight the game name, click Advanced Options button and check “Disable Kill/Death tracking”. The first option disables Game Statistics for all of your installed games. The second method disables Game Statistics for individual games.