As users downarrow through autocomplete choices each is copied in turn into the input control. A malicious site could create a page that autocompletes some common data (such as phone number or SSN) and potentially convince a user to arrow through the values. Script on the page could watch the values as they are added and copy them into a hidden field for submission to the site. http://www.mozilla.org/security/announce/mfsa2005-19.html
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2005-176.html