Where is the file that contains info on previous session info on a Mac? I would like to restore several windows and tabs I had open earlier, but the restore previous session menu item does not appear to be available. I had to install and use an older version of Firefox (3.6) to access a website (Fedtraveler.com) that is not compatible with Firefox 6 and is seems to have cleared out the previous session information. I thought I would use Mac OSX Time machine feature to restore the Firefox file where this the previous session info is kept but I don't know what it is called nor how to find it.