Since FF4, it always restores the session despite setting 'open with blank page'. So it opens the tabs and windows I had open when I closed FF. This was not the case with FF3.6. I have the add-on Fast Dial set to show fast dial thumbnails on a blank page. So the desired (and former in FF3.6) behaviour was that FF opens with a blank page with the Fast Dial thumbs in it. Only when I have chosen to restore the session at exiting FF, it should restore the tabs and windows as previously. I tried to unset and set the setting 'at startup show a blank page' as follows: I set FF to 'show my windows and tabs from last time', closed FF, restarted FF and set the setting back to 'show a blank page'. This did't help. When I disable Fast Dial, FF opens as expected. When I again enable Fast Dial, this did seem to have resolved the issue on a W7 machine, but not an a Windows XP machine.