This interface defines a "permission" object,
 used to specify allowed/blocked objects from
 user-specified sites (cookies, images etc).
[scriptable, uuid(28f16d80-157b-11d5-a542-0010a401eb10)]
interface nsIPermission : nsISupports

Attributes

 The permission (see nsIPermissionManager.idl for allowed values)
readonly attribute PRUint32 capability 
 The name of the host for which the permission is set
readonly attribute AUTF8String host 
 a case-sensitive ASCII string, indicating the type of permission
 (e.g., "cookie", "image", etc).
 This string is specified by the consumer when adding a permission 
 via nsIPermissionManager.
 @see nsIPermissionManager
readonly attribute ACString type