Information Cards are a technology standardized by Oasis Open. To learn more about Information Cards please visit http://informationcard.net/. A user can have several Information Cards, some of them are self-issued and some of them are managed by an identity provider. A website uses an HTML object tag to specify that it supports Information Cards. If an Information Cards addon is installed in a browser this addon starts a selector that allows the user to select the Information Card that is most appropriate for the website. Microsoft Cardspace is such a selector for the Windows operating system.
This addon enable support for Microsoft Cardspace in Firefox.