All,
We plan to release a patch to bring Norton Toolbar compatibility to todays release of Firefox 5.0. This patch will be available TODAY for Norton Internet Security 2011 through LiveUpdate, and will require a reboot of your system. We're in the process of getting the update posted on our LiveUpdate servers.
Also of note: if you are still running Firefox 3.6, we recommend that you upgrade to Firefox 5 or Firefox 4.0.1 before you receive the Norton patch.