The recent patch causes an issue when trying to navigate through the CFA proxy, thus they are not able to view external sites.
Two resolutions have been tested and found working:
1/ Install Internet Explorer 7 or 8– which has the tabbed browsing and full functionality of Firefox.
2/ Uninstall Firefox and reinstall version 3.5.5 (or roll it back if you can).
CFA's IT department only supports Internet Explorer.
If you require us to install Internet Explorer 7 or 8, give us a call at the IT Helpdesk on Ext:8207, and we can do that for you.