facebook, firefox, firewall

so after an exhausting discovering process i found out that my firewall was blocking access to some of facebook's components. a google search seems to confirm Kerio has been known to block facebook for others: http://forums.kerio.com/index.php?goto=55057&t=msg.

anyway, what seems to be the solution at this point: add a specific rule for facebook and allow access, such as the following picture illustrates.