You can either wait until Trusteer tests their add-on and marks it compatible with Firefox 7, or you can install the Add-on Compatibility Reporter to enable it yourself and report whether it works.

Hello, The fix was sent yesterday morning by Trusteer. Hereunder is the link

Hello,

Thank you for contacting Trusteer Technical Support.

We are glad to inform you that a version of Rapport which supports Firefox 7 has been released and is now available for download in the following link: http://www.trusteer.com/book/rapport-installation-links