[Koha] Koha security issue.

We are using mozilla firefox 3.5.4 for Koha access for our patrons. After one patron is done and walks away, the next patron can use the "back" button to access the previous patron's records-if 6 patrons have used this workstation, all of their transactions can be seen by the last patron. Has the new release of Koha addressed this security issue. Does anyone have a "one-patron session" fix for this? Thanks, Rod Alberse Information Technologies Middletown Township Public Library(MTPL)