Now Fixed Thanks. Firefox 3.6 on Mac - I update as available and last version installed about November. Week before Xmas it just stopped retrieving pages - just says "done" in the message bar but no page. I downloaded latest version to reinstall but it refused to install over the old copy: message said "item XUL in use". I trashed the app file and reinstalled from the new installer, same problem. Trashed the prefs file - now when I try to open firefox the message says "a copy of firefox already open". Have rebooted and tried again but same message. Safari isn't that bad but I like firefox. Help!