The security exceptions that allow other sites to install software? Which version did you have before -- 3.6.x or Firefox 11? I don't know whether you regularly back up your computer, but if you have a backup of your Firefox profile folder, then that data should be in there. If you can locate a backup copy of permissions.sqlite, you could use a utility to extract the list. (Or find a volunteer here to assist you with that.) ---- By the way, did your pop-up exceptions and image exceptions carry over? You can check those under Tools > Options > Content.