Abstract: An exemplary computer-implementable method (300) transforms or "immunizes" information to reduce or eliminate risk of exploitation of a known vulnerability of a software service and includes receiving information (304) in response to a request, transforming the information (308) to produce transformed information and sending the transformed information (312). An exemplary firewall server (112) includes server software (144, 148) that allows the firewall server (112) to receive information from a resource (104, 108) via a network and to send information to a client computer (114) and an immunization component (264, 268) for immunizing the information to prevent exploitation of a vulnerability of browser software (154) on the client computer (114). Various other exemplary methods, devices, systems, etc., are also disclosed.