I like to keep my browser open in iTunes as I find it helps me navigate faster through my library, and having del.iciou.us shortcuts placed on the button bar in Firefox is quite convenient. However, whenever I restart my Macbook the two buttons in Firefox are gone and the browser in iTunes is hidden again. It might have something to do with preferences files not being written correctly, but I've only been using OS X for a few days and can't really troubleshoot anything. Help?